Question about Apple Power Mac G5 Desktop
I tried to install new memory, seemed to go smoothly. Once I restarted the machine it beeped (toned) black screen, and the power light flashed. I took new memory out and reinstalled old memory, same problem.
That Happen to me till i found out it was faulty ram causing it to do this
Posted on Jul 17, 2008
Take all the memory out, start up, hear the beeps.
Put the new memory back in, make sure its the right way and well in place, try staring up again.
Posted on Jul 14, 2008
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Selection criteria for a new capacitor are: same capacitance (Greek letter mu and F, looks somewhat like uF), same or higher voltage rating, same or higher maximum temperature rating, highest available endurance at rated temperature, and highest available ripple current rating. A capacitor with too low a ripple current rating will probably burn out prematurely. Also, select for low ESR (Equivalent Series Resistance) or low impedance if you have two parts that are otherwise equivalent on the specs. Oh, and be sure you check the physical size - diameter and height in millimeters. It's embarrassing and costly to order a part, then find it won't fit the space on the circuit board, or it's too tall to put the cover back on over it. Replacing parts on a multi-layer logic circuit board is not a task for beginners. Power supplies are usually single layer and somewhat easier to work on.
If you don't see any bad capacitors, then try disconnecting both the hard drive and the optical drive. If one of these is the problem, your iMac will start with a single normal chime, then the screen will turn gray with a flashing question mark in the middle (it's asking, "Where's my startup disk?"). If it still doesn't act normal, then you probably have a bad logic board (I recommend measuring power supply voltages to verify those are good before buying a replacement board).
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