Flashing folder with a ? in it... HELP!

I bought a refurbed late model 08 about a year ago so I'm beyond warranty.
After leaving to get an external drive to expel some photos (I'm a photog)
I come back to it sleeping... Woke her up n was "thinking" so hard it wouldn't even force quit so I forced it to shut down.
Now, I can't get it to boot up... Tried everything g, I don't have a start up disk... Didn't come with one :(
What do I do! I have to Access these photos.... All inc if a flashing folder with ? Inside.. What does that mean?
Was running fine an hour ago... Many thanks in advance!!

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I got a flashing folder with a question mark. I got a new hard drive and upgraded to 4 gigs and can't open anything or reload the operating system? Help?

I got a flashing folder with a question mark. I got a new hard drive and upgraded to 4 gigs and can't open anything or reload the operating system? Help? FYI: I have been using boot camp with windows 7 and started getting a kernal_data_Page_error and it would reboot windows, i was trying to do a chkdsk on the next reboot, but thats when i started getting this issue. I have put in a new hard drive and went from 2 gigs to 4. I can not get the computer to do anything, even the monitor does not show anything now????

Prep your new drive:
Drive Preparation
1. Boot from your OS X 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.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs,) then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
After formatting has completed quit DU and return to the installer. Install OS X.

When i boot i get a flashing folder with a question mark. disk utility doesnt work or read my harddrives to boot with. i installed a new SSD and its not reading that either. i have a macbook pro 2011, any help?

So I came to this problem a while ago. M ycomputer basically froze so I was forced to shut down by holding the button down. When I started it up I got the flashing folder with a question mark. I started it up holding down the command and r keys which brought me to disk utility. Although my computer doesn't read that I have a hard drive to start it up. When I click on the disk utility app, I cannot verify or repair anything either. The buttons won't allow me to click on them. It also shows "Mac OSX Base System" which shows I have files and what not saved. I had been told that I need a new hard drive so I bought and manually installed a OWC SSD 240GB drive and when i booted the computer up it booted up yo the operating system fine with all my files and what not on there. After about twenty minutes, it froze again. I forced a shut down, restarted and the same thing happened. I am not able to choose my SSD to boot up, although thats probably because it doesn't have an operating system installed on it??
i have a Macbook Pro 13" 2011
any help would be great, I'm overall confused.

ryansaint11,
this isn’t Apple support; this is a user-to-user forum. We’re just fellow users of Apple products here.
If you want to boot from your SSD, then you should put the SSD where your HDD currently is, and put the HDD into the optical bay. (That setup will also get you the best performance.) At the moment, you’re still booting from your HDD. Note that you will need to format your SSD in Disk Utility [with the “Mac OS X Extended (Journaled)” format] so that you can install OS X onto it.
Since you have an Early 2011 model, it might or might not have originally come with grey installation DVDs. You will be able to find out whether it did or not by trying to use OS X Internet Recovery to install OS X onto your SSD. If it does not work, or if the installed OS turns out to be Snow Leopard, then it will have originally come with the DVDs, and you should purchase a replacement pair of DVDs from Apple or iFixit; those discs will have your MacBook Pro’s Apple Hardware Test and its iLife apps. If the installed OS turns out to be Lion, then it will not originally have come with the grey installation DVDs, and your Apple Hardware Test will be installed along with Lion, and your iLife apps will be downloadable from the Mac App Store.

Flashing folder with question mark comes up at startup, HELP!

I turned on my computer this morning (it has been working fine until then) and a flashing folder with a "?" appears. White screen. I don't know what to do, I held the Alt key at startup and that just gets me to a gray screen with my mouse. I'm not too computer saavy so please let me know what I need to do! thanks!

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.
Or for Snow Leopard:
Reinstall OS X 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/.

Grey Screen with Flashing Folder with Question Mark

Hi,
I need some help with an issue I'm having on my Mid-2012 Macbook Pro (13"; OSX 10.9.2; 8GB RAM). I've had issues with this Macbook for the past year. I've worked with Apple Support and had it into the Mac Store prior to the warranty expiring (Dec 2013). I have the exact same model with all of the same specs that my employer purchased at the same time for work as my work computer, and I haven't had any issues with that one.
Previously, the system would slow down excessively and eventually start hanging. Occasionally the screen would start flashing. Apple phone support had me wipe the hard drive and re-install the OS and all of my file, apps, and setting from my Time Machine backup. That worked for about four months, and then it started again. Since it was getting close to the warranty expiration, I took it to an Apple Store. They ran a bunch of diagnostics, said the hardware was all fine but the OS needed to be re-installed. They did that in early Dec, and everything was cool again until about three days ago. Three days ago, it started slowing down and freezing again (even when doing non-memory intensive tasks such as broswing the web with only a couple of tabs open and no other applications open). Last night, it froze hard and wouldn't shut down, so I had to cold boot it. When I tried to power it back on, it came to the grey screen with the flashing folder with the question mark (which I know means it can't find the boot sector). I waited until this morning, and it stil wouldn't boot. I then rebooted into Startup Manager, and the HDD was there. I selected the HDD, and it booted fine and ran fine for a couple of hours (I was able to do a Time Machine backup). Then it froze up solid again. I waited for an hour or so before cold booting (don't like doing that), and when I tried rebooting, I got the flashing folder with the question mark. I tried booting into the Startup Manager again, but this time, my HDD wasn't listed. I then booted into the OSX Recovery utility (CMD R on boot), went into the Disk Utility hoping to do a disk repair, but my HDD wasn't listed. I have an external SATA to USB adapter, so I pulled the HDD, hooked it to a USB port on my other (identical except it doesn't have problems) Macbook Pro. Once my other Macbook booted, the HDD from the bad Macbook Pro showed up fine. I ran a verify and repair disk on the HDD from the bad Macbook, and it didn't show any issues.
So I figured I'd be really brave. I took the HDD from the bad Macbook Pro and put it in my work (good) Macbook Pro (I took the HDD out of my working work Macbook Pro). It booted fine. I then did the verify and repair disk (again no errors) and verify and repair permissions (it found a few, but no more than it has in the past). I ran it that way for about an hour with no issues. That led me to believe that the HDD for my personal Macbook was fine, and it must be an issue with the SATA cable or the mainboard.
Here's where it gets odd. I put the HDD from my work Macbook Pro into the bad Macbook Pro thinking it wouldn't even recognize it. It did recognize it, and it booted fine. I ran it like that for about 30 minutes. It did have a couple of short freeze ups, but it didn't lock up solid. I didn't want to push my luck and possibly damage the HDD for my work Macbook, so I shut down the bad Macbook Pro ended the experiment at that point.
I put the original HDD back in the Macbooks where they originally came from. I then ran the Apple Hardware Test (press and hold D on startup) on the bad Macbook Pro; I did the extended testing option. It ran for about an hour, but it didn't find any issues with the bad Macbook Pro.
I put the HDD from the bad Macbook back in my working Macbook and wiped the disk and reinstalled OSX from a Time Machine Backup from last week (before the problems occured). Put it back in the bad Macbook and still no luck. Finally I tried resetting the PRAM because I saw that as one of the options on this discussion board.
I've searched and read everything I can find related to this, but I can't find anything that works, and I'm at my wits end. Can anyone point me in a direction of what might be wrong and what else to try?
Thanks!
Mike

You performed thorough and methodical troubleshooting, and this appears to be the most important result:
I put the HDD from my work Macbook Pro into the bad Macbook Pro thinking it wouldn't even recognize it. It did recognize it, and it booted fine. I ran it like that for about 30 minutes. It did have a couple of short freeze ups, but it didn't lock up solid.
Given compatible hardware, you ought to be able to swap hard disk drives in exactly that manner, so it shouldn't surprise you that it worked. However, installing the "known good" HDD in the problem machine should not have resulted in any freeze-ups at all.
You can conclude the hard disks (both of them) are serviceable and whatever fault exists probably lies elsewhere. Often the SATA cable is damaged or not seated properly, and is likely to fail more than anything on the logic board. Inspect the logic board's SATA connections and make sure there are no contaminants or damage. The two drives and two logic boards are going to have slightly different component tolerances, so perhaps the defective one is simply exceeding some limit.
Apple Hardware Test is very cursory and essentially tests for the presence of operable hardware. It is far from an exhaustive test, and only a report of a failure can be relied upon for accuracy. For a more thorough test you would need to have Apple evaluate it using the time-consuming Apple Service Diagnostics. Even then, they may come up without a clue, and eventually someone will suggest a logic board replacement which can be expensive.
It is an unusual problem, and I don't know how much time Apple would invest in diagnosing it before they conclude you really ought to buy a new Mac instead. They might surprise you though in that a "depot repair", if yours is eligible, is a very cost effective option so consider it.
Given your ability you might also consider purchasing a replacement logic board from PowerbookMedic, or even sending it to them for a flat rate repair.

My new mac mini (3 month) didn't start up,all that appeared was a white screen and a flashing folder with a question mark inside it.

My new Mac mini (3 month) didn't start up, all that appeared was a white screen and a flashing folder with a question mark inside it.
I followed by recommendations from 'Everything Mac': "shut it down by pressing and holding the power button for about 5 seconds.
Then hold down the Option key and press the power button again to start up the Mac mini. Keep holding down the Option key until
the Mac mini starts up."
But I got a Wi-Fi button only to chose and connect the local network. I connected to my network and I can't use this connection
becouse no icons.
Could you please help me?

Your Mini (running 10.6.4) should have come with grey-colored install disks. Now is the time to put them into service. Turn on your computer so that there is power to accept disk #1 into the optical drive. Once the disk is in the drive, shut off the computer by holding the start button down until it powers off. Then turn it on this time holding down the "C" key to make the computer boot from the disk. The question mark that you saw indicates that the computer cannot find a bootable volume. This can happen due to corrupted system files or an improper shutdown etc. Once you are in the "Installer" you can choose Disk Utility from the Utilities Menu in the menu bar. Use it to repair the disk and to see if that can solve your trouble.

I can't log in to my computer- when it turns on it has a white/gray screen with a flashing folder with a question mark in it. What does this mean and how can I get it to stop to log in?

Hi
I dropped my macbook yesterday and it turned itself off. When I tried to turn it back on all I got was a white/gray screen with a flash folder with a ? in the middle of it? What does this mean and how do I get it to stop so I can log onto my laptop?

Deev
Normally the question mark on the gray screen means it can't find the operating system. Have you tried booting up from the installation DVD? Do that, and when you come to the screen where it wants to begin a system installation you'll notice in the menubar where it say's utilites. Click on that and choose disk utility. from there choose your disk and try to verify and repair the disk. If you can you may want to also try and new install of the system. I don't know how much critical data you have, but reinstalling is an option. did you purcahse you from an Apple store? If you did you may want them to look at it. Hope this helps.
Regards,
Joseph

MacBook Pro gets a flashing folder with a question mark

I start up my computer and I get this flashing folder with a question mark. I looked up on here how to fix it but I get lost when I get to the disk utility part. All that shows up is something called disk0 and below it it says Mac OS X Base System. I click on it but the repair disk button is greyed out. What do I do? Please help!

The MBP cannot find the OSX. It may be a HDD or HDD connection problem.
Start your MBP with the OPTION key down. Select the recovery partition. From the 4 option menu select Disk Utility.
Select Disk Utility>First Aid and run Verify and Repair.
If successful, you should be back in business. If not, the HDD may be faulty.
Ciao.

Getting a flashing folder with a question mark when starting Imac.

I got this flashing folder with a question mark on it when starting my Imac this morning. Im running on Osx 10.6. I put it in target disc mode and connected it to my macbook pro. I opened the disc utility app on the macbook and found my imac. I "verified" it and found an error. When I clicked "repair" the disc utility app froze and crashed. When I opened it again my Imac didn't show up. I've restarted both computers several times with no luck. Whats my next step?

Hi.
Try restarting your iMac while holding down the option (alt) key until the spinng gear appears. You should momentarily be presented with a list of startup drives to select.
Choose Macintosh HD (your normal startup disk drive) and click the right-arrow.
When your iMac boots, go to System Preferences > Startup Disk and again select your normal startup disk. Then click Restart.
I hope this is helpful.
EDIT - disconnect the machines from each other first.

Flashing Folder with "?" at Startup

Hi,
I have a 4 year-old MacBook Pro with Snow Leopard that my sister uses for school. According to her, it was working fine until yesterday morning, when it suddenly had a flashing folder with a question mark on a grey screen upon startup.
I have noticed that this is a pretty common problem amognst other mac users, but there were not any useful answers online. I tried following the instructions from this article (http://support.apple.com/kb/TS1440) but I couldn't even manage to get the startup manager to come up. I have tried several times by pressing the option button immediately after the power button (as I would with my other macs) with no success.
Furthermore, I cannot insert my Snow Leopord installation dvd because there is already a disk inside. Pressing the eject button makes the usual sound before a disk is ejected, but it doesn't actually come out (the folder icon stops blinking temporarily while I press the eject button). Leaving the computer on the grey screen causes the computer to overheat quite a bit, so I leave it turned off, but my sister still needs it for her school project. Because this isn't the main computer, most of our important files are in our other computers so we didn't bother backing it up but I would still like to keep the files on this computer if possible.
Thanks

I had some problems with this computer about a year ago where it wouldn't startup and had a circle slash on a grey screen instead of the flashing icon I have right now. We ended up taking it to an apple store where they just returned it to factory settings because they couldn't find the problem (all the information was lost). It is not however, making the "failing disk noises" as mentioned in a different thread (https://discussions.apple.com/message/18660667#18660667). I have also tried to eject the dvd by pressing the trackpad while it rebooted, but it only made the ejecting noise again with no disk actually ejecting.
Thanks again for all the help,
Reina

Flashing folder with question mark at Startup

Here is what I know so far.
- The computer was powered off by pushing the power button without shutting down.
- The computer was then restarted and it was coming into the white screen with the Apple logo in the middle, but i noticed that it was skewed slightly (like someone took a 4:3 ratio screen and stretched it to a 16:9) and then it would show a circle slash icon and then the flashing folder with a question mark on it.
- It would not come up in single user mode (Command + S) and it said that there was an error loading kernel 'mach_kernel'
- It would not come up in safe mode (Shift)(The flashing folder came up again)
- I reset the PRAM (Command + Option + p + r) and it seemed to fix the problem with the stretched screen but did not help the boot situation (still got flashing folder)
- I did the start up where you can select the hard drive to boot with, it owed the HD and i selected it, but then i got the flashing folder with question mark.
- It would not come up in Verbose Mode (Command V) Error loading Kernel again.
- I bought a FireWire cable and hooked it to another MacBook Pro, and booted the faulty Mac into Target Disk Mode, the FireWire logo came up on the screen and bounced around like all forums said that it would, but the drive would not show up on my host. I checked the System Profiler on the host and it did acknowledge the Target Disk Mode was there, but the drive of the target would not show up on the host. I restarted the host, nothing. I checked all of the connections, nothing. I replugged all of the connections, nothing. I even reversed the FireWire cable, nothing.
- I have DiskWarrior 4 if i can get the drive to show up in TDM, but nothing so far.
Does anyone have any suggestions?

Thanks for your help guys. I managed to get the computer started by holding down C at the Start Up with the Install Disc 1 in the computer. The disc was really kindof unnecessary, as the newest version of Mac OS X (10.4.10) became available via the hard drive.
I then found out that the battery was not installed, so I reset the management system by removing the A/C power, the battery and pushing the power button for 5 seconds, and then reconnecting everything. It did not help, the battery is bad i guess, so I am going to call AppleCare and get a new battery.
Thanks for your help.

HT1366 How to fix Flashing Folder with Question Mark on Mac

How to fix Flashing Folder with Question Mark on Mac

RichardEL is probably correct. I’ll go through your questions.
> there is no Mac OS partition, I assume it would be directly underneath the HD on the left?
I have not seen this particular condition where the hardware disk icon appears but the system volume that is supposed to be below it does not. The System Disk partition would be below the HD icon indented to the right. It is usually called “Macintosh HD” unless you renamed it.
> when I go into disk utility my HD appears on the left, but I can repair or verify it
Odd. It appears but you cannot manipulate it with Disk Utility.
> The S.M.A.R.T status reads verified
If it did not say Verified then it would indicate a problem. Saying Verified does not rule out problems but I think it indicates it is still breathing.
> Is the HD deceased?
If you booted the Recovery Partition (Boot, Command-R), which it sounds like you did, then at least part of the disk is still breathing. If it took a long time to boot then that may have been a Network Recovery boot which would indicate the disk is very sick or dead.
> [If I] restore from time machine [will] everything will be back as it was before?
Yes. That is the beauty of Time Machine. All your data, applications, and system preferences will be as they were as of the last backup.
> I was thinking of erasing the HD, would this be of any help or do I just need a new one?
Given what you reported from the Disk Utility steps you took it is unclear to me if there will be a way to repair the current volume, if you can erase and install from scratch or if you need a new disk. Before proceeding it may be useful to have an expert at an Apple store look at it for you. They may be able to revive it without a clean install or new disk.
As was the case above, it could be a good disk with a bad cable in which case a new disk is not going to help. To test this you can purchase an inexpensive external enclosure, remove the internal disk, place it in the enclosure, plug it in and then use Boot-Option to attempt to boot from the now external disk. Here are links to the screwdrivers and enclosure you would need.
$5 Toolkit: http://eshop.macsales.com/item/OWC/TOOLKITMHD/
$22 USB 3.0 enclosure: http://eshop.macsales.com/item/OWC/ES2.5BU3W/
If you attempt a clean install, use the Partition tab to repartition the disk, selecting one partition and with “Options…” electing a GUID partition. Then use the Erase tab, select “Security Options…” and set it to write a single pass of zeros. This will write to every sector to map out bad blocks. (If you have an SSD do not write a pass of zeros.)
If you do need to replace it I recommend an new inexpensive (~$100) and super-fast hybrid SSHD drive that has an 8 GB SSD cache that makes the data fly. Google “Seagate 1 TB hybrid SSHD”.

What do I do when he only thing on my screen is a flashing folder with a question mark.

I had a few browsers open on my computer. I accessed my calendar and it froze. The mouse would still move, but I could not click on anything. Then the screen went grey with a flashing folder with a question mark. I turned the power off and turned it back only but only see the grey screen with the flashing folder. I tried resetting the PRAM but it still will not work. Can this be fixed? Please help!!

You may have a disk error - could be an unrepairable physical problem with the drive, or a repairable file structure problem.
Hold down cmd-R (both keys together) as you start up the Mac, and keep them held down until you see the Apple menu. When it boots to the recovery partition, click Disk Utility, and run Repair Disk on the Macintosh HD. Let us know if you see errors there and whether or not DU can fix them.
Good luck!
Matt

When i turn on my macbook pro it goes to white screen with picture of folder with ? on it help please

can't log on to macbookpro goes to flashing file with ? in middle help please

A flashing question mark or globe appears when you start your Mac
Question (?) Mark, Blinking Folder, or Gray Screen at Startup
These are related but not identical issues. Their causes are outlined in Intel-based Mac- Startup sequence and error codes, symbols. Solutions may be found in:
A flashing question mark appears when you start your Mac
Mac OS X- Gray screen appears during startup
In most cases the problems may be caused by one or more of these:
a. Problem with the computer's PRAM - See Resetting your Mac's PRAM and NVRAM.
b. Boot drive's directory has been corrupted - Repair with Disk Utility.
c. Critical system files are damaged or deleted - Reinstall OS X.
d. The disk drive is physically non-functional - Replace the hard drive.
Note that the information I have provided is what Apple recommends, If other users suggest different solutions than found here, then be sure what they recommend does not impact on your warranty, if any, or ability to get continuing Apple service.
Please don't start removing drives or changing cables unless you know what you are doing and have exhausted other non-invasive alternatives outlined here. If you perform any work yourself that is unapproved by Apple, then you will void any warranty you may have and lose all further Apple Support.
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.
The main difference if you are using Lion or Mountain Lion is that you must first boot from the Recovery HD. Simply boot from the Recovery HD to perform the above.
Reinstall Snow Leopard Without Erasing The drive
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 Mac OS X 10.6.8 Update Combo v1.1.
Reinstalling Lion/Mountain 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/Mountain Lion: Select Reinstall Lion/Mountain Lion and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

IMac 3.06 (Flashing folder with question mark)

Hi All
Unfortunately this is the second time I have posted about this problem.
First of all my iMac froze and on restart I got the flashing folder with the question mark. However thankfully after 3 restarts the problem appeared to resolve itself. But I still thought it was a little suspicious.
2 days later, my MackBook suffered the same problem, froze up and on restart I got the flashing folder with the question mark. After much effort and advice (see previous question) I unfortunately had to get a new HD installed. $274 for new 160GB, not too bad but just hadnt backed up so lost a lot of data.
Today, approximately 2 more days later my iMac froze again and got the flashing folder with the question mark, but this time it took a very long time to resolve itself. I was beginning to think that it was going to be another trip to the apple shop. Obviously this time I had done a recent backup, so it wouldnt have been a huge problem (apart from financially), just starting to trouble me.
Once I got the iMac up and running again, I went to Disk Utility and ran "verify" on hard disk. Result = no apparent problems. Any suggestions why this is happening, steps I should take to prevent it from happening, what could be causing it? Both computers are relatively new, only approx 10 - 20 GB of data on each, very little interaction between the two. There is another MacBookpro in the household but it has not suffered any problems. Am I getting paranoid? I fear that this is not the last I see of this problem!!

Which iMac do you have? I take it you are no longer under warranty? If your iMac is over a year old you probably need to clean the air intake vents out because dust does build up over time and could cause your Mac to run hotter than normal. You can install iStat Pro to monitor the temperatures and fan speeds: http://www.macupdate.com/info.php/id/20364
You could use a Utility Application to test the drive for bad blocks but that does not help prevent drive failure. There really is not much you can do but to make sure the drive doesn't get too hot. You might install SMART Utility and see if it shows any errors: http://www.macupdate.com/info.php/id/24875/smart-utility
You should also run Apple Hardware Test to make sure that nothing else is wrong with your computer. Run the Extended Test. If that passes with no problems then it's most likely just a bad hard drive and you can have it replaced anytime. You don't have to wait for it to completely die.
George

Flashing folder with a ? in it... HELP!

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