IMac G5 won't boot, only White Screen

I have an iMac G5, no iSight, it won't boot up. It briefly displays the Folder icon with blinking question mark, then White screen. The first time it happened, I rebooted from an external Firewire drive, but only once. When I tried that again, it would not boot.
I disconnected all external devices, no boot.
I can't do Target Disk mode, can't boot from external disk (except that one time-weird exception), can't boot from Install CD. It WAS Open Firmware password protected, but I can't remember if I disabled it or not agfter my last hardware failure. (Note to the wise: if you have an older machine, don't use Open Firmware Password, it can greatly complicate troubleshooting when the inevitable failure happens).
I MAYBE have Open Firmware password enabled, since I
However, I CAN boot into Open Firmware (Cmd-Opt-O-F), I did manage to eject the Install CD that was stuck.
So I opened the back of the iMac. All three LEDs are good, indicating good power supply. I reset the SMU using the little button switch, then tried reboot with the little power button switch. Still no reboot. I tried re-seating the RAM cards, still no reboot.
I'm at the end of my bag of tricks. Does anyone have a suggestion? Is it a hardware problem?
thanks from San Francisco

Well you could try to reset the PRAM, but if your drive is dying it won't help, although it's worth a try.
You can also try using Disk Utility:
Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again 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.
6. Click Repair. Disk Utility checks and repairs the disk.
If none of that works, it's time to take it in.

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I have just tried to restart my 2011 iMac and it has become stuck on the initial white screen (before the grey spinning gear) prior to the reboot it had being running fine for about 4 hours.
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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.
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IMac won't boot past White Screen

Yesterday I turned on my computer and I got stuck at the white screen with the spinning dial and the apple logo. I tried to run disk utility and restore my Mac HD, it says there were problems with it, but when I tried to repair it said it cannot fix them. I then tried to re-install Snow Leopard but when I try to re-install it, no disks appear for me to install it on.
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Sounds like a HD crash, run Apple Hardware Test in EXTENDED MODE at least 3x in succession. If errors appear as I suspect, your next stop is the Apple Store or AASP. If you have been backing up this will be a minor inconvenience, if you have not been backing up then well this will be a painful lesson on why backup is absolutely critical.

My Mac won't boot past white screen and startup keys won't work

Hello. I have an iMac not sure what year.
So about a year ago it froze and wouldn't restart, so I neglected it for a year. Now that this my only fixable Mac I have been researching to fix it. I was able to boot into safe mode about a week ago for a little bit but then it froze again. Ever since then none of the startup keys work, even resetting the PRAM, I heard the second ding and then it just brings up the cursor on the white screen with no disk options.
I have an external disk drive connected to the USB I'd like to boot my Mountain Lion from but since the start up keys don't work I don't know how to do that.
Any help would be incredible, I do not care about saving anything from the computer I just want it to work. I hate dealing with the "geniuses" so that's not an option.
Thanks

When you hear the startup tone hold down the Option key and you should be able to boot into the Recovery Partition if you have Lion, Mt. Lion or Mavericks on the internal HD. If even the Option key does not work then your keyboard may have dead batteries or be defective and in need of replacement.
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IBook G4 won't boot past white screen gray apple.

I'm having problems with my iBook G4 booting up. It won't get past the white screen with gray Apple and clock thing turning. I successfully hooked the iBook to my G4 tower via firewire and can get files off of it as well as run a series of TechTool Pro tests and repair procedures. However, I still have the same startup problem. It never gets past the white screen with gray apple. It's stuck there with the clock continually turning. Is there anything else I could try before getting everything off and wiping the drive clean and starting over? I don't know if it's a hardware or software issue at this point. Thanks for any help you could suggest.
LW

You should at the very least backup your Home folder from it before attempting this, but it appears to be time for a relatively painless Archive & Install, which gives you a new/old OS, but can preserve all your files, pics, music, settings, etc., as long as you have plenty of free disk space and no Disk corruption, and is relatively quick & painless...
http://docs.info.apple.com/article.html?artnum=107120

IMac G5 won't get beyond white screen

Hi.
A friend has an iMac G5 20"
When it is turned on, the white screen comes on, grey apple, but before the screen goes blue there is an electrical clicking sound and he thing cuts out.
In layman's terms, does this sound terminal? or is there something simple explanation?
Thanks
Dave

Well you could try to reset the PRAM, but if your drive is dying it won't help, although it's worth a try.
You can also try using Disk Utility:
Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again 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.
6. Click Repair. Disk Utility checks and repairs the disk.
If none of that works, it's time to take it in.

Macbook won't boot past white screen

My girlfirend's 2009 macbook aluminum unibody ((Leopard 10.5.x) is having a problem booting up. Initially I ran Onyx on it and it said it needed a disk repair. I ran a quick hardware test and it came back ok. I ran Disk Utility off of the cd and it said the repair failed. I believe the message was "invalid node, repair or verify failed." I tried it 3 times. When I went to quit disk utility and restart, it stayed on the white screen with the spinning wheel for a few minutes then the screen went blank. I tried to restart several times, always the same. I have tried resetting PRAM. I tried starting in Safe Mode but it wouldn't. I finally went to reinstall the OS but when it gets to the screen where I have to choose a drive, there is no drive in the screen to select. I don't have Disk Warrior, so can't try that. I'm thinking to remove the hard drive and get the data off of it onto my computer, then to erase her drive and start from scratch. Does anyone have another idea before I go through this?Thanks for the help.

If your OS X installer disc is no longer usable then you can arrange to purchase a replacement by calling AppleCare Customer Service.
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using 1310 buffer headers and 1310 cluster IO buffer headers
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Does it boot into any of these modes?
Target mode...
http://support.apple.com/kb/HT1661
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214
We might get clues with verbose mode...
http://support.apple.com/kb/HT1492

Mac Mini won't boot - displays white screen

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I also installed a wireless keyboard/mouse MS Desktop 1000.
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Try starting you mini in Safe Mode…
http://docs.info.apple.com/article.html?artnum=107393
… to see if you can get it to start. I think it might have been a bad software installation that's done it. More than likely it was the keyboard and mouse.
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So I have an 11" MacBook Air, and one day it randomly just wouldn't boot, it just stayed white. I tried to do it manually by holding the alt key while booting. When it was supposed to show the operating, nothing was there but the wifi connectivity bar.
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Holding down the Option key when booting theoretically will prompt the Startup Manager window where you can select the startup disk then click Restart.
Startup Manager: How to select a startup volume
When you post for help, please state which OS X is installed.
If you aren't sure, click About this Mac from your Apple menu 
Troubleshooting advice can depend on that information.

My iMacG5 will only boot to white screen, gray apple and spinning gear. Help?

My iMacG5 will only boot to white screen, gray apple and spinning gear. Help?
Also not totally sure if it's an Intel based computer, but that's what I recall. Any way to check, since I can't get to About This Mac window?
It's running on OSX Leopard 10.5.4
First symptom = running slowly - then it kind of froze with color wheel spinning - thought a forced shut down would help - help power button til off, then white screen, gray apple and spinning gear.
Have tried...
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Then try booting from your install disc again.
- No change
And...
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo
appears.
5. Wait for installer to finish loading.
- The fan just got louder.
Thanks for your help.

You need to do an Erase and Install or an Archive and Install depending on whether the hard drive is OK or needs to be reformatted.
Start by booting from your Leopard DVD. The rest is just following directions.
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
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 Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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. Now restart normally.
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. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

My iMac won't boot past grey screen and it didn't come with a os x disk

My iMac won't boot past grey screen with apple. I've tried booting in safemode but that didn't help and my iMac didn't come with a os x disk.

Take each of these steps that you haven't already tried. Stop when the problem is resolved.
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.”
b. 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.
c. 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 either of the techniques in Steps 1b and 1c 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 you use a wireless keyboard, trackpad, or mouse, replace or recharge the batteries. The battery level shown in the Bluetooth menu item may not be accurate.
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, or if a firmware password is set, or if the startup volume is a Fusion Drive or 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 10. 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
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 10
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 11
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 12
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.

Start up Disk full and MacBook Pro won't reboot. Only white screen but can sleep, restart, shut down.

Start up Disk full and MacBook Pro won't reboot. Only white screen but can sleep, restart, shut down.

Reboot into Safe Mode (hold the shift key down at the sound of the chime, release when the progress bar appears) Safe Mode will take longer to boot than normal.

IMac G5 won't boot, only White Screen

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