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Member Since: Apr 11, 2012
Posts: 13
Cosmo2323 is on a distinguished road

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Try resetting the PRAM and NVRAM first:

Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

A lot of the time resetting the PRAM and NVRAM can clear up issues like this.

I would suggest contacting Apple support. If you've reloaded the OS, this is proof there is no issue with the any software on the machine.

As doubtful as it seems a hardware issue could have arisen from this power supply fault.

You can run the Apple Hardware Test equivalent for your Mac. (Just do a google search for it)
This is a bootable CD image or you can image a USB HDD to boot AHT from USB.

Basically what it does is a full hardware check, I would suggest doing this first.

If you're not sure what this is, let me know and I'll see if I can find the correct AHT you need, as normally there are different versions of AHT for different models.
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