Question about Apple (661-2795) for iMac Motherboard

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Imac motherboard following electrical storm, motherboard failed. os 9.2/10.3 locks up at boot. no evident damage. any suggestions?

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Hack the setup procedure and create a new admin. Here is the link to show you how.

http://www.ihackintosh.com/2009/05/how-to-hack-the-user-password-in-mac-os-x-without-an-os-x-cd/

Posted on Sep 16, 2012

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I have a aple imac and i forget the admin password and i cand log me in
can you help me

Posted on Sep 24, 2008

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Posted on Jan 02, 2017

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Hard drive may be bad or installer disk has scratches. Replace hard drive and disk and try again.

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My Imac (MA877LL) was on during a lightning storm. After li9ghtning stuck close to my home, my computer flash and went off. There were other mnor problems with other electronics at the sameutton time and...


1.Unplug all cables from the computer, including the power cord.
2.Wait 10 seconds.
3.Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
4.Let go of the power button.
5.Press the power button once more to start up your iMac
Visit the link below:
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You may have a problem with your internal hard drive.
If you have your original software disks, you can boot the computer from them and run Disk Tools to analyze and possibly correct any problems.

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My dear friend you've not mentioned what exactly the problem you are facing please be specific if you can. Basically the operating system fails to install because of the following reasons
1. OS CD Damaged / corrupted.
2. Disk Drive Corrupted.
3. Some files of OS in the CD got corrupted/damaged.
4. Your hard disk master boot record got damaged.
5. Your motherboard got damaged.

Hope i was able to solve your problem.

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Imac g4 won't start but shuts down when apple logo appears on screen


Are you sure the iMac is really shutting down or just turning off the backlight? The tell-tale sing would be to let the unit fully boot-up (wait 3 minutes) and the press the button the apple keyboard that ejects the CD-ROM. If the CD-ROM door opens, you iMac is running with disabled or broken backlight.
The inverter circuit on the iMac G4 is known to be weak.
There could be another problem, though. The iMac G4 is also known to have weak internal power supplies. Here's how you can tell:
Hold down the CMD OPT "O" and "F" keys at the same time while pressing the power button. This will tell the iMac that you want to boot into the Open Firmware shell, bypassing the Mac OS X startup. If this works, your power supply is good, the inverter is good and you have a problem with your Open Firmware boot string. To fix the boot string, Power on the unit while holding down the keys CMD-OPT-P-R to zap the parameter RAM (PRAM) and reset everything to defaults.
If you were not able to boot into the Open Firmware shell, your problem is either a failed power supply or a failed screen backlight. The last possible culprit is your iMac could suffer from "Bulging Capacitor Syndrome", where a batch of iMac G4s, iMac G5s another electronics were fitted with a bad batch of capacitors. Eventually, the caps will rupture and cause irreparable damage to the logic board. Only way to verify this is to pull the unit apart and visually inspect. If you see little green or blue cylinders that seem to be bulging or oozing a thick oily goo, that's your problem. Only recourse is to shop around on eBay and look for a replacement logic board.

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1 Answer

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1 thing to check is did you apply new thermal paste to the processor before putting motherboard back in?

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2 Answers

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1 Answer

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