Unable to run apps on MacBook Pro won't launch

Hello,
Mac OSX v 10.6.8
processor 2.7 i7
memory 4 gb
MY MacBook Pro, 2010 has ground to a halt. I am unable to launch a web browser. I have tried to run disk utility with limited success, I am not even sure that my hard disk is displaying in disk utility. I do have some external drives which I have connected in the past. I have tried running first aid, but keeping getting the spinning wheel.
I think that I may be running out of memory, but can't do much to fix it as the spinning wheel of death keeps appearing. I have removed a number of large files from my desk top. I have also tried a reset NVRAM/PRAM.
I have had issues with my internet dropping a few months ago. As a result I don't have a really recent back-up. Does anyone have any other suggestions?
thanks.

First try a safe boot:
http://support.apple.com/kb/HT1564
If no success, take the original installation disk and start up the MBP with the disk in the DVD drive and holding the C key.
Start the installation sequence and proceed until you see a menu bar on top of the display.
Click on UTILITIES.
From the drop down menu select Disk Utility.
Run Disk Utility>First Aid, Verify and Repait.
What are the results?
Ciao.

Similar Messages

MacBook Pro Won't Launch Some Apps

I have a Late 2007 MacBook Pro 17" (Santa Rosa). For the past couple of months, I cannot launch some apps including:
- iMovie (appears with a light under the dock but the window to actually use it never comes up)
- iDVD (crashes with window that says that it quitted unexpectedly)
- Final Cut Express 4 (crashes instantly)
- LiveType (acts just like Final Cut)
- and a whole lot more.
I have tried to reinstall all of these apps but they do the same thing over and over again. I have also reinstalled Snow Leopard after a complete wipe of the hard drive. Actually, I have even swapped the hard drive inside the MacBook Pro, but no avail!
So I have done these things:
1. Reinstalled all of those apps.
2. Reset PRAM.
3. Reinstalled Snow Leopard from wiped hard drive.
4. Reinstalled Snow Leopard after swapping in new hard drive.
After this, I brought the computer to the Genius Bar. They've also reinstalled Snow Leopard twice and don't know what to do. Right now I have a half-working MacBook Pro. I am hoping you and other people on the internet know how to fix this. I am lucky that the 17" MacBook Pro isn't mission critical because I have just gotten a new 15" MacBook Pro to replace it, but it would be nice to have the 17" working again as a secondary computer.
Any suggestions? Thanks!
If this helps, there is a little history about this computer - I bought it new and around the second year the graphics card died. It was the NVIDIA GeForce 8600m with 256mb of dedicated memory. The logic board had been replaced by Apple and the machine is just over the second year with the new logic board. Is it time for the second logic board's graphics card to die out?

Have a go at repairing the disk (why didn't it start up, i.e. what did it do/show exactly?)
Start up from your disk, or if on lion the Recovery HD by holding the alt button at startup and selecting it, then click the arrow underneath, select your language once the window comes up and click on DiskUtility at the bottom of the list in the main window. Then select your Macintosh HD and "repair disk". It will tell you if it thinks the disk is ok. If you are starting up from a disk, DiskUtililty should be at the very top (the writing) under "Utilities", not the main window, which will only let you re-install the operating system.
Questions: what operating system? All apps or just some? Do you know anything else helpful, like installations, deletions just prior? Font problems?

My Macbook pro won't open downloaded programs. it just opens the code it was written in using the text and edit app. How can I fix this?

My Macbook pro won't open downloaded programs, it just opens the code it was written in using the text and edit app. How can I fix this? I just bought the computer last month so this is some what frustrating.

If you are downloading .exe files, those are Windows programs, and will not run on your Mac unless you install Windows on it. (That is possible, if you need one of those apps.)

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Hello Rattisate,
Sorry to hear you are not able to connect to Wi-Fi on your MacBook Pro. I would be concerned about this too. You can find information on how to troubleshoot this in the following article:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
http://support.apple.com/kb/HT4628
Follow the steps in the section labeled, "Symptom: My Mac does not connect to the Internet."
Thank you for posting in the Apple Support Communities.
Best,
Sheila M.

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Working battery needs to be in for the computer to function.

HT1379 Guys please help? My MacBook Pro won't start up. I have tried the resetting Mac's PRAM and NVRAM procedure with no success. All I see is just the black or grey screen although I hear the drive running.

Guys please help? My MacBook Pro won't start up. I have tried the resetting Mac's PRAM and NVRAM procedure with no success. All I see is just the black or grey screen although I hear the drive running.

Hold shift key down while booting should get you in
go through this list and get back with me
Step by Step to fix your Mac

My MacBook Pro won't go beyond a white screen, after I pushed the restart button. How can I get it to a login? I have routinely backed it up, but don't know how to bring that up, nor if I have a boot file on that external disk. Help!

My MacBook Pro won't go beyond a white screen, after I pushed the restart button. How can I get it to a login? I have routinely backed it up, but don't know how to bring that up, nor if I have a boot file on that external disk. Help!

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

My macbook pro won't start up. I get the white screen and the grey apple icon   the spinning wheel......and it doesn't change !

My macbook pro won't start up. I get the white screen and the grey apple icon   the spinning wheel......and it doesn't change !

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
To restart an unresponsive computer, press and hold the power button for a few seconds until the power shuts off, then release, wait a few more seconds, and press it again briefly.
Step 1
The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
There are several ways to back up a Mac that is unable to start. You need an external hard drive to hold the backup data.
a. Start up from the Recovery partition, or from a local Time Machine backup volume (option key at startup.) When the OS X Utilities screen appears, launch Disk Utility and follow the instructions in this support article, under “Instructions for backing up to an external hard disk via Disk Utility.” The article refers to starting up from a DVD, but the procedure in Recovery mode is the same. You don't need a DVD if you're running OS X 10.7 or later.
b. If Step 1a fails because of disk errors, and no other Mac is available, then you may be able to salvage some of your files by copying them in the Finder. If you already have an external drive with OS X installed, start up from it. Otherwise, if you have Internet access, follow the instructions on this page to prepare the external drive and install OS X on it. You'll use the Recovery installer, rather than downloading it from the App Store.
c. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, start the non-working Mac in target disk mode. Use the working Mac to copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
d. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.
Step 2
If the startup process stops at a blank gray screen with no Apple logo or spinning "daisy wheel," then the startup volume may be full. If you had previously seen warnings of low disk space, this is almost certainly the case. You might be able to start up in safe mode even though you can't start up normally. Otherwise, start up from an external drive, or else use the technique in Step 1b, 1c, or 1d to mount the internal drive and delete some files. According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation.
Step 3
Sometimes a startup failure can be resolved by resetting the NVRAM.
Step 4
If a desktop Mac hangs at a plain gray screen with a movable cursor, the keyboard may not be recognized. Press and hold the button on the side of an Apple wireless keyboard to make it discoverable. If need be, replace or recharge the batteries. If you're using a USB keyboard connected to a hub, connect it to a built-in port.
Step 5
If there's a built-in optical drive, a disc may be stuck in it. Follow these instructions to eject it.
Step 6
Press and hold the power button until the power shuts off. Disconnect all wired peripherals except those needed to start up, and remove all aftermarket expansion cards. Use a different keyboard and/or mouse, if those devices are wired. If you can start up now, one of the devices you disconnected, or a combination of them, is causing the problem. Finding out which one is a process of elimination.
Step 7
If you've started from an external storage device, make sure that the internal startup volume is selected in the Startup Disk pane of System Preferences.
Start up in safe mode. Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Post for further instructions.
Safe mode is much slower to start and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know the login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
When you start up in safe mode, it's normal to see a dark gray progress bar on a light gray background. If the progress bar gets stuck for more than a few minutes, or if the system shuts down automatically while the progress bar is displayed, the startup volume is corrupt and the drive is probably malfunctioning. In that case, go to Step 11. If you ever have another problem with the drive, replace it immediately.
If you can start and log in in safe mode, empty the Trash, and then open the Finder Info window on the startup volume ("Macintosh HD," unless you gave it a different name.) Check that you have at least 9 GB of available space, as shown in the window. If you don't, copy as many files as necessary to another volume (not another folder on the same volume) and delete the originals. Deletion isn't complete until you empty the Trash again. Do this until the available space is more than 9 GB. Then restart as usual (i.e., not in safe mode.)
If the startup process hangs again, the problem is likely caused by a third-party system modification that you installed. Post for further instructions.
Step 8
Launch Disk Utility in Recovery mode (see Step 1.) Select the startup volume, then run Repair Disk. If any problems are found, repeat until clear. If Disk Utility reports that the volume can't be repaired, the drive has malfunctioned and should be replaced. You might choose to tolerate one such malfunction in the life of the drive. In that case, erase the volume and restore from a backup. If the same thing ever happens again, replace the drive immediately.
This is one of the rare situations in which you should also run Repair Permissions, ignoring the false warnings it may produce. Look for the line "Permissions repair complete" at the end of the output. Then restart as usual.
Step 9
If the startup device is an aftermarket SSD, it may need a firmware update and/or a forced "garbage collection." Instructions for doing this with a Crucial-branded SSD were posted here. Some of those instructions may apply to other brands of SSD, but you should check with the vendor's tech support.
Step 10
Reinstall the OS. If the Mac was upgraded from an older version of OS X, you’ll need the Apple ID and password you used to upgrade.
Step 11
Do as in Step 9, but this time erase the startup volume in Disk Utility before installing. The system should automatically restart into the Setup Assistant. Follow the prompts to transfer the data from a Time Machine or other backup.
Step 12
This step applies only to models that have a logic-board ("PRAM") battery: all Mac Pro's and some others (not current models.) Both desktop and portable Macs used to have such a battery. The logic-board battery, if there is one, is separate from the main battery of a portable. A dead logic-board battery can cause a startup failure. Typically the failure will be preceded by loss of the settings for the startup disk and system clock. See the user manual for replacement instructions. You may have to take the machine to a service provider to have the battery replaced.
Step 13
If you get this far, you're probably dealing with a hardware fault. Make a "Genius" appointment at an Apple Store, or go to another authorized service provider.

MacBook Pro won't reboot. Get spinning circle even after hard drive replaced at Apple Store

MacBook Pro won't reboot. Have to reinstall OSX each time I shut down in order to get it to start up. What could be wrong? I had the hard drive replaced already.

You shouldn't be using the disc at all. I thought I had made that clear. Boot from your recovery partition and run Disc Utility. If you get the same result -- the internal drive can't be repaired -- then you should consider replacing it. No storage device can be trusted, in my opinion, after throwing an error like that. But whether you choose to replace it or erase it, you have to get the data out first.
There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
1. Boot from your recovery partition (10.7 or later), a local Time Machine backup volume (10.7.2 or later), or your installation disc (10.6.8 or earlier.) Launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
2. If you have a working Mac, and both it and the non-working Mac have FireWire ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive.
How to use and troubleshoot FireWire target disk mode
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

MacBook Pro won't sleep when charging

My 15" i5 MacBook Pro won't sleep when charging; a reboot of the machine solves the problem temporarily, but it always recurs. When I close the lid and listen carefully, I can hear hard drive activity; the drive sounds like it keeps spinning up every 10 seconds or so.
This is not an issue when trying to sleep when running on the battery only. Any advice?

I don't have launch2net installed.
I'm not sure how this will help, but here's the last 5 lines from Console:
11-07-13 5:19:46 PM          Butler[156]          cache: adding applications...
11-07-13 5:19:46 PM          Butler[156]          cache: adding addresses...
11-07-13 5:19:47 PM          Butler[156]          cache: categorizing...
11-07-13 5:19:49 PM          Butler[156]          updated abbreviations cache (enabled)
11-07-13 5:19:58 PM          SIMBL Agent[133]          warning: failed to get scripting definition from /Applications/Utilities/Console.app; it may not be scriptable.

OSX 8.2 new Retina Macbook Pro won't wake from sleep.

Since upgrade to OSX 8.2 new Retina Macbook Pro won't wake from sleep. Tablet lights are on in morning and fans running like crazy, but it requires hard quit and start. Tried with no apps running, no change. It was fine before this last update. Wasn't the recent firmware update supposed to fix this issue? It seems to have started one for me.

I have the exact same problem with my Macbook Pro OS 10.8.4. What happens is: I work on the train, press cmd/alt + eject to put to sleep..pop it in my bag...get home or office... open the lid...and nothing! Battery indicator shows I have plenty of juice but it will not wake up no matter what key I press.
The only difference between use on the train and home/office is the plugging in of peripherals and mains power. It happens sparadicially, perhaps once or twice a week and I always send a 'panic report', so somewhere there will be approx 20 reports of this fault at Apple.

Macbook Pro won't mount during target disk mode

I don't know what to do.
I was using Safari today when the whole computer froze. Nothing was responding, so I had to force shut down.
When I went to restart, I got a gray screen with the apple logo and a progress bar; the bar will take a while to fill, then the computer shut down completely. Happens every time now.
I tried booting in safemode and it didn't work; the command prompt details said "Incorrect number of thread records. (4, 29503)" and "Incorrect number of extended attributes (It should be 381007 instead of 381008)"....... What does that mean????
I tried booting the backup drive and running disk utility to diagnose the problem, and it said the disk is unable to be repaired etc.
Now I'm trying to salvage my important files by using the firewire target disk mode with another mac. My macbook pro won't even mount; disk utility said it can't be mounted and is damaged.
Please help--what do I do to save these files???

My workflow was like this:
Partitioned fresh hard drive into 2 partitions: 1 for OS clone, 1 for data recovery
Used Carbon Copy Cloner (an excellent tool) to clone working OS to 1st partition
Attached harddrive to malfunctioning MBA
Held Option on malfunctioning MBA and booted to cloned drive
Once booted, I used old-school Data Rescue II to salvage data from MBA internal drive to my data recovery partition. (Probably need a newer / better data recovery program, as this one changed file names, moved things around, was generally not that awesome...)
Used Disk Util from booted clone to format MBA internal drive.
Used Carbon Copy Cloner to clone to formatted MBA internal drive.
Shut down, disconnected external drive, MBA booted normally.
Think that's everything. I've been touting the excellence of Carbon Copy Cloner for a while now for backups. In my opinion it's much more thorough than Time Machine backups, as you don't need a functioning OS. You can boot to a clone -- time / life saving!

My MacBook Pro won't load any websites on Safari (except this site, Facebook and Google), Opera, or Mozilla Firefox. I already did the "Reset Safari", restarted the computer half a dozen times, and I can't find this alleged "caches.db" file to delete.

My MacBook Pro won't load any websites on Safari (except this site, Facebook and Google). Opera and Mozilla Firefox won't load any sites whatsoever. I already did the "Reset Safari" several times, restarted the computer half a dozen times, and I can't find this alleged "caches.db" file to delete. I virus scanned the computer with Sophos, Avast, and iAntiVirus and it looks clean.

Is iAntiVirus the best virus protection to use for a MacBook?
The best anti-virus protection is your own common sense, and what you already bought and paid for with your Mac. Third party products such as "iAntiVirus" convey no additional benefit, and as you already determined are very capable of causing trouble.
OS X already includes everything it needs to protect itself from viruses and malware. Keep it that way with software updates from Apple.
A much better question is "how should I protect my Mac":
Never install any product that claims to "speed up", "clean up", "optimize", or "accelerate" your Mac. Without exception, they will do the opposite.
Never install pirated or "cracked" software, software obtained from dubious websites, or other questionable sources. Illegally obtained software is almost certain to contain malware.
Don’t supply your password in response to a popup window requesting it, unless you know what it is and the reason your credentials are required.
Don’t open email attachments from email addresses that you do not recognize, or click links contained in an email:
Most of these are scams that direct you to fraudulent sites that attempt to convince you to disclose personal information.
Such "phishing" attempts are the 21st century equivalent of a social exploit that has existed since the dawn of civilization. Don’t fall for it.
Apple will never ask you to reveal personal information in an email. If you receive an unexpected email from Apple saying your account will be closed unless you take immediate action, just ignore it. If your iTunes or App Store account becomes disabled for valid reasons, you will know when you try to buy something or log in to this support site, and are unable to.
Don’t install browser extensions unless you understand their purpose. Go to the Safari menu > Preferences > Extensions. If you see any extensions that you do not recognize or understand, simply click the Uninstall button and they will be gone.
Don’t install Java unless you are certain that you need it:
Java, a non-Apple product, is a potential vector for malware. If you are required to use Java, be mindful of that possibility.
Java can be disabled in System Preferences.
Despite its name JavaScript is unrelated to Java. No malware can infect your Mac through JavaScript. It’s OK to leave it enabled.
Block browser popups: Safari menu > Preferences > Security > and check "Block popup windows":
Popup windows are useful and required for some websites, but popups have devolved to become a common means to deliver targeted advertising that you probably do not want.
Popups themselves cannot infect your Mac, but many contain resource-hungry code that will slow down Internet browsing.
If you ever see a popup indicating it detected registry errors, that your Mac is infected with some ick, or that you won some prize, it is 100% fraudulent. Ignore it.
Ignore hyperventilating popular media outlets that thrive by promoting fear and discord with entertainment products arrogantly presented as "news". Learn what real threats actually exist and how to arm yourself against them:
The most serious threat to your data security is phishing. To date, most of these attempts have been pathetic and are easily recognized, but that is likely to change in the future as criminals become more clever.
OS X viruses do not exist, but intentionally malicious or poorly written code, created by either nefarious or inept individuals, is nothing new.
Never install something without first knowing what it is, what it does, how it works, and how to get rid of it when you don’t want it any more.
If you elect to use "anti-virus" software, familiarize yourself with its limitations and potential to cause adverse effects, and apply the principle immediately preceding this one.
Most such utilities will only slow down and destabilize your Mac while they look for viruses that do not exist, conveying no benefit whatsoever - other than to make you "feel good" about security, when you should actually be exercising sound judgment, derived from accurate knowledge, based on verifiable facts.
Do install updates from Apple as they become available. No one knows more about Macs and how to protect them than the company that builds them.
Summary: Use common sense and caution when you use your Mac, just like you would in any social context. There is no product, utility, or magic talisman that can protect you from all the evils of mankind.

My MacBook pro won't start. It is frozen on the gray screen with the apple. Please help?

My MacBook pro won't start. It's stuck on the gray screen with the apple logo.

Reinstall OS X:
Reinstall Snow Leopard without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.
Reinstalling Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.

My MacBook Pro won't start. It's old, c 2008, any ideas?

My MacBook Pro won't start. It's old, c 2008. Have tried many suggestions on line: opt, cmnd, r,p, etc. Any suggestions?

Hey treasure hunter,
I found some help for when your computer won't turn on. Try each of these steps:
Verify you have a good connection from your Mac to the wall outlet by confirming the power cord and adapter if present are securely connected and plugged in. To check if the wall outlet is working, plug in a lamp or other electrical device.
If the wall outlet is working and you continue to have no power try another power cord or adapter if available. If it works you may need a replacement cord or adapter.
Note: See Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to the computer, such as a printer, hub, or other mobile device.
If your Mac supports user-installable memory, solid state drive, or hard drive, and you recently installed any of these, make sure they are installed correctly and are compatible with your computer. If possible, reinstall the original memory or drive into the computer to find out if the behavior persists afterwards.MacBook Pro: How to remove or install memory
Reset the SMC.
If you are still unable to start up your computer after trying each of these steps, visit an Apple Store or Apple Authorized Service Provider (AASP) for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
via: Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367
Welcome to Apple Support Communities!
Regards,
Delgadoh

Unable to run apps on MacBook Pro won't launch

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