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Model A1224 / Mid 2007 및 Early 2008 / 2, 2.4, 또는 2.66 GHz Core 2 Duo 프로세서

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I get a white screen upon power on.

I have an iMac A1224, when it is powered on, the apple boot noise occurs, then a white screen comes onto the monitor.

It appears that it sounds like the hard drive is still going, but not everytime.

I have reset the RAM, CTRL, ALT p-r does nothing. Unplugged power for a day, still white screen.

Is there anything I can do myself? I am a technician and this Mac has been brought into the shop. If I can do something, good, if not where to send it for a quote?

Thank you all.

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Please help!

Please give the last three letters of your serial number, located on the bottom of the stand. Are you a PC or Mac tech?

ZE5 is serial number and I am awaiting a customer to bring the system disk in!

I have already tried all Key holddown startup combinations.CTRL-ALT-P-R and others. Nothing changes the white screen. I do not have a cable to hook to an external monitor. I can get one I guess. Mac specific cable I presume.

Did you get the system installation disk? BTW - I don't work on PCs because I don't know what I'm doing with them.

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Past history on the intel machines ( macbooks and iMacs) is when the hard drive goes bad, you get the white / grey screen and you might or may not get the computer to boot to the DVD. The thing that has worked for me on 90 percent of my clients machines is I have replaced the Hard Drive.

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mactech is correct, I forgot this one. Disconnect the hard and see if it will boot from the DVD to test.

White Screen: I can access the HD via (T = Target disk mode) the external monitor does not work. Also have exhausted all Startup commands. Wont boot 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?

I have replaced the hard drive with wd 500gb and get white screen. This fix didn't work for me.

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Apple iMac "Core 2 Duo" 2.4 20-Inch (Early 2008) Specs

Identifiers: Early 2008 - MB323LL/A - iMac8,1 - A1224 - 2210

I'll change the iMac icon to the correct one. Hook it up to an external monitor and see if you get the desktop. It sounds like it may be hanging on boot up. Try holding down the Shift key on startup to try starting in Safe Mode. Try what remac said, select the drive on the left and run the repair in Disk Utilities till it runs clear.

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Hold down the mouse button while starting up to eject the disk. If you have another Mac start this one up in Target mode and see if you can repair the drive.

Here's how: http://support.apple.com/kb/HT1661

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Start it from a installation DVD. Hold down the "c" key with the disk insertet. If it starts this way go to the second screen (the one after the language choice) and select Utilities -> Disk Utility.

Verify the soundness of the HDD.

Please post the results.

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Ok, got disk not 4 seconds after posting that...amazing. Anyway, it sounds like it is reading the DVD but white screen remains. Pressing C does nothing. Power off, again, spins and reads DVD but nothing on screen. Now how do I get that disk out? What happens now? Anything I can do inside this beast to get it to work?

It sounds like you were using an external keyb and mouse. I hope you found the solution. I know you posted was a while ago

you can get the disk out by pressing and holding f12

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Really late to the party but I'd like to point out somethings.

To reset the parameter ram on a Mac you hold down cmd+opt+p+r and not control it has been this four finger salute since the compact Macs.

White screen can be a number of things so before you tear down your iMac which is a real PITA to do you should determine if it is something simple. Did the pram reset work?

If not and you have an external monitor handy and the Apple external monitor adaptor try plugging it in and see if you now have a desktop. If yes it might be an idea to backup or copy off any files and data that you might want should things go bad further on down the line.

If you did not get a working display on the external monitor you could try running an install DVD if you iMac came with one or if you can get a hold of a working iMac of the same generation you could try building a USB boot key by cloning the known good OS onto the USB key and booting your Mac with it. I recommend using Carbon Copy Cloner available here, https://bombich.com for this task if you build USB key. Typically though if the HD is bad or the OS is corrupted you will get an error on screen.

If you do see your desktop on the external monitor, go to System Preferences -> Displays and check to make sure that your primary monitor is selected. This is done by dragging the bar from the external display (2) to the primary display (1). Did this suddenly solve the problem?

If not it may be something a bit more involved. You could try reinstalling your operating system though it's also possible that your Mac has succumbed to a known failure issue which is a bad video card. Some folks have reported success with reheating the pins on the failed card using a mini butane torch. I have used this method on some Macs and PCs over the years and though it does initially work there is the chance that at some point the card will fail again. However if your iMac falls into this category and Apple will not help you out with their hidden extended warranties then this might be your only option if you feel adventuresome. Btw there are some who put boards in toaster ovens or full size ovens, personally I would not do this and if you went to a proper repair shop their will have an infrared rework station that is safer than using the micro torch method but also a more expensive option.

At this point though you are talking about getting really down and dirty with the insides of your iMac and this might be exceeding your comfort level. So if you think your iMac is scrap you might want to consider removing the drive and recovering what you can if the external monitor trick did not work. There are plenty of inexpensive external SATA hard drive cases or even SATA docks on the market that you can plug your hard drive into which can then be opened on another working Mac. Also a number of Youtube videos on the subject, you will need a set of small Torx screwdrivers as Apple tends to use these and Phillips on their computers.

I currently have an iMac A1224 on the bench with white screen, replaced the ram, reset PRAM as well as did a full reset (shift+command+p+r) and hooked up an external monitor. The external monitor shows the desktop fine and the Mac functions in this manner however the built in screen is still white which makes me think in this instance that the screen itself has failed.

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Just to follow up on this thread, I was able to secure another iMac A1224 for parts which had a working LCD screen. As it turns out if you have an iMac with a white screen and faint image of the desktop it is the LCD that has gone bad and not the inverter board or hard drive.

The Mac will also display properly on an external monitor so that rules out a bad graphics card.

The screen being white/illuminated rules out a bad inverter.

Replacing the hard drive will not solve this particular issue.

If you need to recover your data in this particular situation you can use a Firewire cable and Target disk mode which is accessed by holding the letter T when you boot your problem iMac. This Mac's hard drive will then show up as a logical drive on your second Mac and you can recover any data you need.

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Credit card in the superdrive will get the disk out. I have the same problem with my 20" 2007 iMac. Chime, white screen, all drives spinning and powered, then nothing. The only keyboard shortcut that appears to be working is PRAM reset. I tried all of the above tricks and every other one I have been able to find. External monitors, known good RAM, new drive, new disks, 3 keyboards, target mode, and many, many more.

I finally gave up and took it to the Apple store. Three weeks later they told me it was the logic board. $435. I called Apple, emailed Tim Cook, dealt with Apple executive relations. They finally waived the labor at the store - $39 discount. woo-hoo. They refused to tell me the failure rate for this component or what rate qualifies as a known issue.

I'm looking for a "soldering iron" type solution now. I refuse to pay Apple's part-swappers $400 for what is probably a $2 capacitor fix.

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"Capacitor" - can you please indicate which capacitor and why?.

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My iMac early 2008 started to boot to a white screen. Replaced the logic board, no change. Removed the graphic card, gently set it up in a vice and applied hot blown air with a paint gun for about 3 minutes to reseal any broken solder joints. Let it cool and reinstalled with new thermal paste. Problem cured.

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Always, always, have a USB boot disk to hand. It makes diagnosing problems much easier.

From my experience, a dead hard drive will result in a question mark being displayed on boot. Faulty RAM will involve a black screen and beeps. A failed display will give you the chimes but a black screen. On the logic board, there is an array of LEDs below the display connector, which will light up if the board is operational.

The white screen boot problem sounds like a bad graphics card. From my experience, the GPU is the most likely thing to overheat on an iMac. As you cannot easily open the machine, dust accumulates inside it, trapping airflow and eventually leading to overheating failure. Typical symptoms are random lines appearing across the display at all times, and / or booting to a blank screen. However, you can still usually boot to safe mode, even when the display is messed up. If you’re really stuck, you can hold down Control+S on startup and go into single user mode. If that works, your CPU, disk and RAM is probably okay - or at least okay enough to get a kernel initialised. You can then recover data from the disk.

Resealing the old card’s joints with a heat gun sometimes works, as does finding a replacement GPU from a donor Mac. For this model, it’s an ATI Radeon 2600XT. If you’ve already done a hard drive upgrade on a pre-2012 iMac, and fitted a CPU with thermal paste before, you should be able to swap out a graphics card in under two hours.

It’s somewhat ironic that given their reputation as “sealed” units, these old iMacs are some of the most upgradable!

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