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PowerPC G5プロセッサを搭載したiMac G5は、2004年にリリースされました。

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iMacG5 20"1st gen won't start replaced logic board and powersupply

Imac g5 1st gen won't start, have replaced logic board and power supply. Leds show power, cuda restart and power mangement have had no effect. Led #2 will flash. Any other possible problems which will cause g5 not to start?

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A solid #2 LED shows that the logicboard has detected a working power supply. As yours is flashing indicates that something is wrong with the supply side. Redo all the wiring very careful and observe again.

No.1 LED shows trickle voltage. It is lit whenever the computer is plugged into a wall outlet.

No.2 LED shows that the LB detects all the various voltages it needs to be happy.

No.3 LED shows that the graphics communicate with the diplay.

No.4 LED signals a overheating situation and should never come on in normal cicumstances.

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led #1 is always on, it is #2 that will flash when cuda pressed, according to apple site, that means replace power supply which I did. It could also mean mother board is bad, hence the new mother board. Anything else that could cause Imac to start up? I have press the power managment cuda, and reset cuda, Just stumped...

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Have you checked either LB for bulking/leaking capacitors? As you might already know, this is a major problem with these machines, albeit sometimes fixable. Please keep us updated.

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fturk さん、ありがとうございました!
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