I am new to OSX and I downloaded an app known as virtualbox. It made my computer buggy and my friend told me to drag it to the trash and call it a day, so I did, but its still loading virtualbox kexts, I can see from single user mode and its still buggy.

How exactly do I uninstall, and unload the kexts?

Kext files are installed to /System/Library/Extensions so if you look in there you might be able to find some for that application in specific. I use the app called "appcleaner" to remove all my unwanted apps on my Macbook Pro.
http://www.freemacsoft.net/appcleaner/
Open the app and look for the app in particular you are trying to delete. If you can't find the app go to the finder and drag it into the appcleaner app. You may have to reinstall the virtualbox app in order to uninstall it.

Similar Messages

IMac G5 won't boot in normal and safe mode, but will from single-user mode

Hello everyone,
I'm quite new here, so I try to do my best if you have a question.
Yesterday, someone nearby me had a iMac G5 (Powermac8,1), and he sayd, that the computer sometimes will boot, sometimes not.
I did test it, I thought it was running fine, but when I played some music in iTunes, it was stuck on 9 seconds, and crashed (with a kernel panic). The guy also sayd, that there was nothing important on the computer, so a clean install was fine.
Now, the problem is, that it will not boot in normal mode (without anything pressed on boot), also it won't in safe mode (shift-boot), but it will, when I enter single-user mode, mount the hard drive and exit from single-user mode so it will go futher on booting. Sometimes it will not, and immediately gives you a kernel panic in single-user mode, but it will 90 percent of the time.
Then you've got another problem: when it's running in the normal desktop from single-user mode, it'll be stuck after some time again. If I look into the Kernel Panic file created, most times it's because of Spotlight indexing, so I disabled that.
He also gave me the disks (Apple Hardware Test and Extra Applications, and iMac G5 Mac OS X Install Disks 1-3) that came with the Mac. He sayd that I could use them, but I think he didn't test out the SuperDrive, because when I insert a disk, it will try to read, but it will make 2 same sounds, and quits after 10 tries, when it will spit the cd out. Also normal (audio) disks.
Also, I must hurry with the commands for mounting and exiting in single-user mode, or it will just not boot.
In all cases, after 30-45 seconds from pressing the power button, the fan will start blowing at full speed, and it will stop after the exit command in Single-user mode. That's weird.
I can't do anything with the SuperDrive, I can't normally boot in Mac OS X except for Single-user mode (but I don't think he would like to do that every time the computer boots up), and I have very limited time when Mac OS X arrived on the desktop.
When booting in Verbose mode, it will be stuck on this:
AppleSMU::PMU vers = 0x000d004c, SPU vers = 0x15, SDB vers = 0x01,
(and sometimes ends with a kernel crash by fsck_hfs)
Things I've tried (without any success):
- /sbin/fsck -fy (in single-user mode)
- Disabling Spotlight and mds
If you want some more information, feel free to ask!
Greetings
-MrYoranimo
PS: My main language is Dutch, so my English can be bad at some points.

Thank you for your support! This reply is a little bit late, because I was to the camping this weekend.
The only thing I sure do know, is that the iMac has a bad SuperDrive. That's one problem, but I don't really wanna use it, and you fix everything by Single-user mode and when I get to the desktop to test things and change stuff in the Preference Panes.
What also came to my mind was that there also is a problem with the videocard (driver), because sometimes when I boot into Single-user mode, I can see some white pixels which aren't supposed to be there. And when booting from SUM you can see that some of the colors are different and there are weird patterns on the screen.
I also tried to setup a NetBoot server on this computer (MacBook Mid 2010) with just Lion 10.7.4 on it, but I'm not that expert and I didn't really find the good posts on the Internet, although I tried it with the Server applications and both Server applications and DeployStudio. But I didn't succeed.
I don't really like buying a new FireWire hard disk or external FireWire dvd reader/writer, except if it has USB support, because my MacBook doesn't support FireWire, and I really wanna make use of it then.
If I know more or have fixed it, I will surely post again here with what I did to fix it (if no one else has posted here already ).

MBP only runs if I start in single user mode and run fsck. WHY!

I am having trouble with my MBP. If I don't start in single user mode and run fsck -fy twice, I can't click on anything with my trackpad. I can't even log in. I've tried resetting pram/nvram, disk permission repair too but once i reboot... nada. I can't do anything in recovery mode, I can move around with arrows and tab but can't select anything. Safe mode hangs at about 20% and doesn't budge (left it for an hour, nothing). If I run fsck -fy it works but as soon as I reboot/ logout i'm back to square one again. Anyone know what causes this to happen? It just started tonight. I have a 2012 15" with Mountain Lion.

The boot drive is failing, or you have some other hardware fault.
Back up all data immediately, then make a "Genius" appointment at an Apple Store to have the machine tested.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to bare metal from any of them.) Don’t erase the recovery partition, if present.
*An SSD doesn't need to be zeroed.

Stuck in single user mode and can not get past it

I am experiencing a problem I recently had lent me a Mac g4 tower. I decided to upgrade to tiger and accidentally set the start-up preference to the disc, every time I boot up it goes into single user mode, if I boot up holding the option key it brings up 3 icons on the right is an arrow in a circle formation which is refresh at a guess in the middle is the hard drive which is depressed kind of thing and on the right is a straight arrow. I have tried selecting each of these individually and even pressing enter all but the refresh icon goes back into single user mode. When the disc is in and I go to this it does not ring up the disc as an option.
I have zapped the PRAM reset the CUDA button and even telling it to reset the NRAM etc.
I have tried it with the disk in and out and all paths lead to the same outcome it starts up I hear the tone and the screen goes grey with an apple icon on then it goes to lack screen saying localhost:/root#.
I have also used the (fsck –fy) in single user mode to scan the disk and it says it appears to be ok. I have done all these steps multiple times but I am still getting the same outcome.
I have also tried pulling the logic battery and pressing the cuda switch and leaving it to stand and even pulling the RAM but this has not worked and I am still getting the same out come of been put straight in to single user mode.
I have tried starting up in safe mode but again this just goes to single user mode as well.
As yet I have not tried booting up using this machine as a slave drive or using another Mac as a slave drive and seeing what this out come does as I have not got access to another Mac at this time.
Unfortunately I do not have the original discs that came with the machine either so can not even boot from them.
Any other ideas would be greatly appreciated thank you.
Please read my post properly thanks.
I have tried several key commands such has D, C and even holding (option, command, shift and delete) when i do this it just brings up a folder with two changing flashing icons.

Ok checked them out and followed the instructions given, but still getting the same outcome, looked at the system log and it tells me.
localhost login: PAM pam_inithandlers:no default config /etc/pam.d/other
localhost login:PAM error reading PAM configuration file
localhost login:PAM pam_start:failed to initialize handlers
localhost shutdown: halt by andy
Any more ideas???

OSX will not start after reboot from single user mode

Hello,
Yesterday my iBook G4 was only starting in BASH mode. I've looked at discussions describing Kernel Panic and have followed the advice posted to the following post:
http://discussions.apple.com/message.jspa?messageID=1553062#1553062
When I reboot I get past the language setup and the boot progress screen/progress bar gets almost complete before going to a continuously stalling/reloading blue screen.
When I try the command:
rm /var/db/.AppleSetupDone
described in one of the responses I get a 'No such file or directory' message
I assume that as when I try:
cd /System/Library/CoreServices/Setup\ Assistant.app/Contents/MacOS
It returns '-rwxr-xr-x 1 root wheel 58912 16 Aug 21:10 Setup Assistant'
it is the file that is missing.
As the discussion thread I was following seemed to go off on a bunch of other tangents (and was completed), I am hoping somebody might have suggestions for my specific problem under this new discussion.

Welcome To  Discussions Kongxyz!
It will help if you first post some background info.
"...only starting in BASH mode."
Explain exactly what was happening, and what the screen displayed.
Exactly which model iBook G4 is it?
What is the Processor speed?
What size is the Hard Drive, and how much space is available?
How much RAM is installed, and is it original or added?
Which version number of Panther 10.3.x is installed
What peripherals do you have connected? A keyboard, mouse, printer, external drive or modem, router, etc?
What happened between the last time the iBook started successfully, and when it didn't?
Have you made any changes, like upgrading the system, updated or installed any applications or programs, etc?
Have there been any unusual occurences, like freezes, crashes, power outages, etc?
Are you able to startup from the system install disc to run Disk Repair?
Have you run Repair Permissions?
Instructions posted below.
Is the Mac shutdown overnight, or does it run 24/7?
Have you ever run any routine Maintenance procedures?
THESE ARE THE STEPS FOR USING DISK UTILITY TO REPAIR YOUR HD
1.Insert the System Install disk, Mac OS X CD-ROM disk, or Restore DVD disk, then restart the computer while holding the C key. Use the System disk, of the OS, that is currently installed.
2.Once started up from CD or DVD, on the Menubar at the top of the screen, choose Disk Utility from the Installer contextual menu.
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from disc to access Disk Utility.
3.Click the First Aid tab.
4.Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5.Select your Mac OS X volume, if necessary.
6.Click Repair. If DU reports errors it has fixed, re-run Repair Disk until no errors are reported.
7.Repeat steps 5 & 6, but select the Hard Drive this time. It's usually the first listed with the manufacturer's model number. Make note of the S.M.A.R.T. status.
8.When finished, select Quit Disk Utility from the Installer menu.
9.Select Quit Installer from the Installer menu.
10.In the resulting pop-up window, choose restart.
11.After the computer has restarted, you can eject the CD.
TO REPAIR PERMISSIONS ON THE STARTUP DISK
1.Open Disk Utility, located in Applications/Utilities, and select the startup disk in the left column.
2.Click First Aid.
3.Click Verify Disk Permissions to test permissions or Repair Disk Permissions to test and repair permissions. (I never "Verify". Just run "Repair".)
Rerun RP until the only messages reported, are listed here Spurious Permissions Errors Using: 10.3.x, authored by Michael Conniff.
When "Repair Permissions" is complete. Quit "Disk Utility".
ali b

Single-user mode: How to mount and access an external USB drive?

My MacBook Pro HD is acting up. Cannot boot normally or into "safe mode". Cannot reinstall OS without wiping out the HD. Need to recover some critical files but DiskUtil First Aid and Restore options cannot successfully complete. Problem traced down to "invalid node structure" which means I either have a hardware problem or my filesystem partition directory structure is corrupted. I need to recover some files that are not backed up (timin issue with my regular backup process).
I can boot into single-user mode, mount the root file system (/sbin/mount -uw /) and can see/navigate the rot filesystem structure via good UNIX command line. Here's what I would like to do (in single-user mode):
1. Mount an external USB drive (250 GB already formatted as Mac OS X Extended)
2. Copy various files and/or directories from my HD to the external USB drive (UNIX cp command)
I realize I could go spend $$ for the Disk Warrior or Data Rescue products (or something similar) that SHOULD help me recover my HD or files, but it seems silly to do this when I can see, touch and taste them from within single-user mode....
Comments? Suggestions?
TIA --
Trent
P.S. Once I've recovered my files, I'll try to reformat the HD and then reinstall the OS. And THEN go have Apple look at my machine (thank goodness for AppleCare coverage)!

Resolution:
1) Boot system in single-user mode (SUM) with external HD attached.
2) Execute the following UNIX CLI commands once SUM boot process is completed:
# fsck -fy
# mount -uw /
# mkdir /Volumes/target_directory
# mount -t hfs -w /dev/diskXXX /Volumes/target_directory
# cp -RXv /source_directory /Volumes/target_directory
Where XXX is the device-level name for your external HD's data partition. In my case this was /dev/disk1s2. It may take some experimentation to identify this device name if your system has multiple HD's.
3) Verify contents were successfully copied onto the /Volumes/target_directory.
Comments and observations:
- Do NOT use "/" as your source directory - cp will make a second (redundant) copy of /volumes/target_directory
- I was able to successfully copy ALL files off my HD despite the fsck command's "invalid node structure" error message with this simple procedure. YMMV, depending on the state of your HD.
- The repeated disk0s2: I/O error warnings displayed during the SUM boot process did not seem to have a negative effect on this procedure. I also received this same error warning intermittently as I navigated the mounted filesystem did not seem to be a problem, either. Again, YMMV.
Commercial software:
I downloaded ProSoft Engineering's Data Rescue 3 product (trial version) before spending $99 to attempt to recover my "bad" HD's data via mounting to a good system with FW target mode. It could not successfully complete its "QuickScan" process and immediately hung on block 0 of 390M during its "Deep Scan" process. The product did seem to function properly on an operational system. ProSoft's technical support was responsive and helpful but had no answer for my "Deep Scan" error.
I did not attempt to use Alsoft's Disk Warrior 4 product. I could not find any trial software available and was reluctant to spend $100 based upon the mixed reviews and comments on this discussion forum as well as other reviews. Alsoft does claim to address the "invalid node structure" error in their marketing materials. Hindsight being 20/20 - I saved $100 by using this simple procedure.
Final note:
Neither Leopard nor Snow Leopard's installation DVD could recognize the bad internal HD when trying to do a reinstall. While DiskUtil was able to "see" the bad internal drive it immediately failed when I tried to do an "erase and format". Took the system to my local Apple store and the Genius ran a tool called "SMART Utility" from Volitans Software (www.volitans-software.com). SMART utility confirmed that my HD was bad so it was replaced. AppleCare pays for itself (once again!).

I changed my wheel group properties to no access at top disk level. I messed up, how can I change back in single user mode "command s" as I am now in Thailand and not able to access startup disks?

I messed up, I changed my "Wheel group" properties to No Access ( or something other than the default) at the top level of my startup disk "Macintosh HD".   Now my computer won't start up, I just get the spinning wheel of death.    I also am in Thailand right now, so I cannot go to a Genius at an apple store, nor do I have startup disks available.
So I was hoping there was a way to change back the properties of my disk (Volume) in single user mode (via Command +s) during startup, i.e. can I do a chmod command on the Macintosh HD listing under the Volume Directory.    Or where do i fix this?   Is it fixable without startup disks, etc...
THANKS FOR ANY HELP!!!!
If you could also please let me know you have an answer, I WOULD REALLY APPRECIATE IT!!!
thanks so much
mark
<Edited by Host>

Thomas,
Thanks for the info on command-R, didn't know about that!!!
Yes I changed the sharing "Wheel Group" permissions on my hard drive via Get Info.    But that's all I did.    And then most of the apps wouldn't respond with anything.    So not knowing I did something stupid, I decided to re-boot, and then nothing but the Wheel of Death at startup.
I was trying to limit access to my computer on this network, changed my public folder settings, and then I thought why not the whole hard drive, but at that time I had no idea what the "Wheel Group" was... so I shouldn't have touched it, BUT IT DID ...... argggggg....
I managed to go to an internet cafe & research the problem yesterday.    I used the command +s single mode to get in, and then did the necessary steps to mount the drive so I could make changes.   I basically did this:
Boot into single-user mode (boot while holding down CMD-S)
Follow the on-screen instructions to mount the file system as read-write (a fsck command followed by a mount command)
Type the following: "chmod o+r /" followed by "chmod o+x /"
Type "exit" to leave single user mode and complete the boot sequence.
I found it at this link http://forums.macrumors.com/showthread.php?t=416180
It worked... thank God!!!   Well so far so good.
I was going to try my own fix by chmod on the Hard drive listed under Volumes directory, but that doesn't seem to match the info under Get Info Window.    So I just used the fix above.    I probably should now go and do "Disk Utility - repair permissions", however I am a little gun shy right now, so I will probably wait until I am back in the States so I can go to an Apple store if it messes up.   Right now I'm following the "if it ain't broke, don't fix it" MOTTO...
So Thomas I just wanted to say THANKS for replying so quickly, and I really appreciate your help!!!
(yes I know I shouldn't have used my email addresses, but I WAS DESPERATE, but that's still no excuse)
Hopefully maybe this thread will help someone else out in the future....
Okay, thanks again!
Mark

10.4.3 and Single User Mode, now Wireless Keyboard can

Hello all.
IN case you haven't found out which I did, just to let you know, with the latest OS 10.4.3 update, now you can boot into Single User Mode (fsck) with your
b wireless keyboard
and still at the same time
b continue to complete fsck process with your wireless keyboard!!
No more switching to a regular wired keyboard just to complete the process!
Cheers

Hi Steven, bit unclear on a couple things.
When I went into single user mode the fans went wild. But I knew this to be normal and proceeded with repairing the disk
Normal for fans to go wild in single user or when repairing the disk?
I replicated the problem applied the same fix and again every thing was normal.
The problem being screaming fan and the fix being resetting SMU? (unplug for 15secs). So how did you replicate it, and is it really fixed now?

Single user mode, Lost Admin Account, and Disk Permissions

Okay, so I have quite a few issues here. I will start from the beginning.
About a week ago, I tried to install some updates and I could not get the Admin account to work. I went to the users profile and noticed my Admin account was not there. Did a quick search and found Apple's outline of how to fix this via the Operational DVD and the root user. Tried this and it would never work, because as soon as I restarted the computer or changed screens it switched back to a standard account.
Next up, I went into the terminal to check the Admin User group. As it turns out it is not there. So I find a discussion on there that outlines how to rebuild this in single user mode and the Unix prompt. So, I print it off and try to restart in single user mode. After trying two different keyboards and a sum total of 8 to 10 times, I can't restart in single user mode to get to the Unix prompt.
One last thing, last night I went into the Disk Utility on the start-up DVD. I wanted to check the Repair Permission log and I got the following:
ACL found but not expected on "private/var/root/Library/Preferences"
ACL found but not expected on "private/var/root/Library/"
ACL found but not expected on "Network"
Thoughts?
Thanks for your help!
tpp

first, the ACL messages can be ignored. if you can't get to single user mode you can't fix your admin group. the only reasons that I know why you wouldn't be able to do that is
1. a defective keyboard
2. you have a firmware password set. have you? you'd have to turn it off before you can get to single user mode.
lastly when you restart in single user mode make sure you press command+s right after you hear the chime. do not press it too early or too late. lastly, I'm not sure which instructions you've found to fix the admin group but I have them in this thread
http://discussions.apple.com/thread.jspa?messageID=8011324

Single User Mode - mount external drive and make it r/w

How can I access a USB disk and make it read/write?
I can't +mount -uw /Volumes/"Time Machine Backups"+ because it says that the disk is a special type.
Can I just use chmod because the disk is automounted?
When I attempt to chmod my USB disk, I get this message:
chmod: /Volumes/Time Machine Backups: Read-only file system
chmod: /Volumes/Time Machine Backups/.autodiskmounted: Read-only file system
I know that I can cp from the internal disk, since I can cat the pictures to the terminal. But I can't make the external hard disk writeable.
I need to do this from single user mode, because the machine won't boot from the DVD.
-Michael

Just got back from the apple store. The genius found these things:
* My DVD is fine. It loaded in another computer
* My computer is mostly fine, except for the hard disk. It was able to boot off of an external Firewire disk.
* The DVD drive is fine. When the computer was booted off the external disk, it was able to mount my DVD.
* The internal HD is definitely bad. Drag/drop copy to an external HD was going to take 3 hours for about 30 files. Disk Utility shows it in red.
* He suspects that the failing HD prevented the machine from being able to load a DVD. (?)
His advice:
1 Buy a new 2.5" SATA disk at Frys.
2 Buy a USB sled for the old disk
3 Replace the failing HD in the laptop with the new, unformatted disk
4 Boot from the OS X DVD
5 Install the OS from the DVD
6 Reboot from the internal HD
7 Insert the failing HD in the sled, and connect it to the computer once it's booted off the new HD. Copy everything from the /users directory
8 But a new HD for the sled and use it for Time Machine backups
9 Teach the daughter the importance of regular backups
Let's hope this works.

My blk MacBook wouldn't start and is now stuck in Single user mode

Hello all-
I recently inherited my brothers old black macbook when he got the new "macbook air" and while surfing the web land safari froze, I tried to force quit- nothing happened. I held the power button until it went off. When I tried to reboot it got stuck on the blue screen with the apple logo and the spinning (loading) circle, it never get to the log in screen. After hours it just becomes a blue screen. After reading forums I tried rebooting in single user mode and I haven't been able to complete the process because i can't enter commands. Here's what the bottom part said i can give the rest if needed:
+nfs_boot : networking is not initialized+
+panic(cpu 0 caller 0x002C561D): fsbootinit failed with 6+
+Debugger called: <panic>+
+Backtrace, Format - Frame : Return Address (4 potential args on stack)+
*soooo then there were lots of codes after that (let me know if you need them)*
Kernal version:;
Darwin Kernal Version 8.11.1
Sooooo I don't know what to do....Please help
I don't have apple care and the nearest apple store is 3 hrs away and I cant get there til monday, any help will be greatly appreciated. Thanks soo much
Jade:)

What you've gotten is a kernel panic. There are a few things that can cause this.
The first thing to do is get your hands on the disks and follow my last set of instructions for verifying and repairing your hard disk.
While you wait for them, however, there are a few more things to try:
1) Hold down the commandoption+pr keys while you turn the computer on. Continue holding them until the Mac restarts a second time. This will reset your NVRAM.
2) Reseat the RAM modules inside the MacBook. Poorly-seated RAM modules are one of the leading causes of kernel panics at startup. To do this, follow these instructions:
http://docs.info.apple.com/article.html?artnum=303721

Screaming Fans ,10.4.3., and Single User Mode.

I wanted to add my experience with the screaming fan problem and 10.4.3.
When I ran Disk Utility and used the verify disk option I received some minor errors and proceeded to boot the OS X install disk and run Disk Utility from there. When I did I received no errors. Rebooted back to 10.4.3 and reran disk utility and received the same minor errors. So I read one of the Mac sites that stated that one needed to run in single user mode and execute fsck f. This where the fun started.
When I went into single user mode the fans went wild. But I knew this to be normal and proceeded with repairing the disk (which was successful as evident with no errors being reported while booted to the desktop and running live verify disk. But before I got to that point the fans remained screaming after the reboot to 10.4.3. I reset the PRAM and NVRAM but to no avail. The fans would not quite down. The fix turned out to be very simple I unplugged the computer (after shutting down) for about 15 seconds. Re plugged it in and it was fine after that. Fans back to normal! I replicated the problem applied the same fix and again every thing was normal.
I just thought I would pass this on to the iMac community.

Hi Steven, bit unclear on a couple things.
When I went into single user mode the fans went wild. But I knew this to be normal and proceeded with repairing the disk
Normal for fans to go wild in single user or when repairing the disk?
I replicated the problem applied the same fix and again every thing was normal.
The problem being screaming fan and the fix being resetting SMU? (unplug for 15secs). So how did you replicate it, and is it really fixed now?

Macbook shuts off during start-up - can't get through safe-mode, single user mode (fsck -fy) and target-drive shows no problems when running disk utility repair

Hi everyone,
I'm simply all out of ideas on what to do - my best guess is the problem is not specifically hard-drive related since all the 'normal' fixes just won't work.
What could be the cause of my issue? The only way i've managed to keep the Macbook Pro on for longer than a minute is through target drive, where it seems to work just fine - i can access everything. To sum up everything:
1 - I tried resetting the PRAM
2 - I tried to go in to safe mode, it shut off before i could type the password
3 - I tried fsck -fy command from single user mode, sometimes i can get to actually typing it but mostly it shuts off before
4 - I tried to repair disk via target drive - success, no problems detected (and it didnt fix my issue)
5 - I reinstalled OS Mavericks.
The Macbook Pro previously had some problems with the power-button not working properly (a mac-cunning friend of mine had to open up the mac and start it by swiping to metal pins on a specific (battery/power?) part inside it. The problem kinda went away afterwards but it might be related to this?
This is way off my comfort zone of 'diagnosing' issues, so I'm crossing fingers for some good advice.
Thanks,
Aske
Denmark

I think you're right.
If it's hardware related, is it possible to guess at what it might be? It would be nice to know how much I should expect to pay for a repair before actually getting it fixed.

How do I delete a program I downloaded? I dragged it to the trash from download, but its icon is still there?

I downloaded a program and don't want it. I dragged it to the trash from "downloads" but the icon is
still there. I want to get rid of it totally.

Still where? If in the Trash, then Empty the Trash. If in your Applications folder then select the application's icon. CTRL- or RIGHT-click and select Move to Trash from the context menu. Empty the Trash.
Uninstalling Software: The Basics
Most OS X applications are completely self-contained "packages" that can be uninstalled by simply dragging the application to the Trash. Applications may create preference files that are stored in the /Home/Library/Preferences/ folder. Although they do nothing once you delete the associated application, they do take up some disk space. If you want you can look for them in the above location and delete them, too.
Some applications may install an uninstaller program that can be used to remove the application. In some cases the uninstaller may be part of the application's installer, and is invoked by clicking on a Customize button that will appear during the install process.
Some applications may install components in the /Home/Library/Applications Support/ folder. You can also check there to see if the application has created a folder. You can also delete the folder that's in the Applications Support folder. Again, they don't do anything but take up disk space once the application is trashed.
Some applications may install a startupitem or a Log In item. Startupitems are usually installed in the /Library/StartupItems/ folder and less often in the /Home/Library/StartupItems/ folder. Log In Items are set in the Accounts preferences. Open System Preferences, click on the Accounts icon, then click on the LogIn Items tab. Locate the item in the list for the application you want to remove and click on the "-" button to delete it from the list.
Some software use startup daemons or agents that are a new feature of the OS. Look for them in /Library/LaunchAgents/ and /Library/LaunchDaemons/ or in /Home/Library/LaunchAgents/.
If an application installs any other files the best way to track them down is to do a Finder search using the application name or the developer name as the search term. Unfortunately Spotlight will not look in certain folders by default. You can modify Spotlight's behavior or use a third-party search utility, Easy Find, instead. Download Easy Find at VersionTracker or MacUpdate.
Some applications install a receipt in the /Library/Receipts/ folder. Usually with the same name as the program or the developer. The item generally has a ".pkg" extension. Be sure you also delete this item as some programs use it to determine if it's already installed.
There are many utilities that can uninstall applications. Here is a selection:
AppZapper
Automaton
Hazel
CleanApp
Yank
SuperPop
Uninstaller
Spring Cleaning
Look for them at VersionTracker or MacUpdate.
For more information visit The XLab FAQs and read the FAQ on removing software.

I am setting up a new iMac and need help syncing files to Dropbox. On my old computer I had it set where when I saved a document, it was saved on my hard drive, as well as to a folder in Dropbox. I can't remember how I set this up. Any help?

I am setting up a new iMac and need help syncing files to Dropbox. On my old computer I had it set where when I saved a document, it was saved on my hard drive, as well as to a folder in Dropbox. I can't remember how I set this up. Any help?

The way that Dropbox works is that it keeps a copy of all your files in your local Dropbox folder on your hard drive (which is, by default, directly under your home folder). Adding files to that folder will sync them to the Dropbox server.
You do of course have to download the Dropbox application to enable this (download link at the top right of http://dropbox.com ).
Matt

I am new to OSX and I downloaded an app known as virtualbox. It made my computer buggy and my friend told me to drag it to the trash and call it a day, so I did, but its still loading virtualbox kexts, I can see from single user mode and its still buggy.

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