Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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White Screen no apple logo

2007 20" EMC 2133

White Screen: I can access the internal HD via (T = Target disk mode) all is well there. The external monitor does not work via mini display port to HDMI. Also have exhausted all Startup commands. Also unhooked the internal HD to try to boot from DVD zilch. Wont boot (via option @ start) from USB stick or DVD will spin up but zilch. My best guess is the video card. Could it be the logic board or LCD issue? Also there is a dark gradient from the bottom to mid screen. This was happening prior to the white screen of death. Any help or thoughts would be appreciated. Thanks in advance.

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If you are not getting an eternal monitor to fire up, I'd go for the GPU.. I've reflowed a lot of these on the 2007 model with a 70% success rate using a hot air work station:

iMac Intel 20" EMC 2133 and 2210 Video Card Replacement

iMac Intel 20" (EMC No. 2210 or 2133) Graphics Card

iMac Intel 20" (EMC No. 2210 or 2133) Graphics Card Image

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Please advise if the used GPUs offered via fixit be a reasonable fix or is reflow best outcome.

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I see the price has really dropped on that GPU. Since iFixit offers a lifetime warranty and if you don't have the hot air work station, go with the part.

iMac Intel 20" (EMC No. 2210 or 2133) Graphics Card

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Not all steps may be required to resolve the problem, you may be able to simply reboot into Safe Mode and reset NVRAM and fix the white screen issue, for example.

Reboot into Safe Mode

This is quite easy; simply reboot into Safe Mode on the Mac with a properly timed shift key press.

Reboot the Mac as usual, then immediately hold down the SHIFT key, release the SHIFT key when you see the Apple logo and progress bar

Attempting a Safe Boot is easy and it can remedy some simple issues with a Mac getting stuck on a white screen during boot. If the Mac works fine in safe mode, try rebooting again as usual (without holding down Shift) and see if it works as usual, it just might.

You can learn more about Safe Boot mode on Mac here if interested.

Reset NVRAM

Often simply resetting NVRAM / PRAM is sufficient to remedy a white screen Mac issue:

Reboot the Mac, the moment you hear the boot chime, hold down the Command+Option+P+R keys concurrently, when you hear a second boot chime you can release the keys, the NVRAM has been reset

After NVRAM has been successfully reset, go ahead and let the Mac boot as usual. At this point it should no longer get stuck on a white screen.

Reset SMC

Since the white screen problem seems to occur mostly on portable Macs, we’ll focus on resetting SMC on modern MacBook Pro, MacBook, MacBook Air models:

Shut down the computer and connect it to your MagSafe adapter and a wall outlet as usual

Hold down the Shift+Control+Option+Power button at the same time for a few seconds, then release all keys concurrently

Boot the Mac as usual

For other hardware, you can learn how to reset SMC on Macs here.

Reboot and Repair Disk

If possible, try to repair the boot disk through Disk Utility by entering into Recovery Mode:

Reboot the Mac and hold down Command+R to boot into Recovery Mode

Choose “Disk Utility” from the list of options at the Utilities screen

Select the hard drive and then go to the “First Aid” tab and choose to run First Aid and repair the drive

If the drive is showing many errors, particularly errors that can’t be repaired, you may have an underlying issue or drive failure impending. If that’s the case, be sure you backup your data from the Mac, and then consider using Apple Hardware Test to diagnose any issues. Often replacing a hard disk is in order, some users are comfortable doing it themselves otherwise you might want to contact an Apple Support center for official assistance in replacing the drive or diagnosing whatever other system issue persists.

Boot with Verbose Mode

This won’t doesn’t make a lot of sense, but it sometimes works: boot into Verbose Mode. Keeping in mind that all Verbose Mode does is detail what’s going on during system boot, similar to watching a linux machine start up, it’s not entirely sure why this works but there are multiple reports on Apple Discussion Forums that it does.

Reboot the Mac as usual, then immediately hold down COMMAND + V keys

Again, it’s not entirely clear why this works, perhaps it’s just the general act of rebooting yet again as verbose mode shouldn’t really do anything different aside from appearances, but nonetheless it does seem to sometimes work to bypass a stuck white screen on some Macs.

Reinstall Mac OS

If the other approaches are failing, you may need to reinstall Mac OS system software. You should always backup your Mac before doing this. Aside from having a proper backup, reinstalling Mac OS or Mac OS X is fairly straight forward:

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