Chimes into Black Screen

I recently bought a dead 20 inch iMac G5 (with isight). I was told it was an Intel Core Duo 2.16 but have been unable to confirm this. The label underneath says it's a G5 Model A1145. I get a startup chime and 2 of the 4 LED's light up. The screen is black with the fans running heavy. I've pulled the logic board and power supply and all capacitors look fine. It's very clean for it's age. I get no power from the USB ports. Caps Lock and mouse do not light up.

Can anyone point me in the right direction?

Thank you.

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Apple iMac G5/2.1 20-Inch (iSight) Specs

Identifiers: iSight - MA064LL/A - PowerMac12,1 - A1145 - 2082

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LED #3

Indicates that the computer and the video card are communicating. This LED will be ON • when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.

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If this were the case, would I get to see the gray apple logo screen? It's pretty spotty, but I do get to that point sometimes and then it freezes.

Also, after unplugging and plugging back in, I can get "Your computer needs to be restarted..." message. Again, pretty spotty on that too. Mostly black screen.

Thank you!

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This was a direct quote from Apple on the meaning of the diagnostic LEDs. I don't make this stuff up

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What I meant was would the video card be the culprit if I get video every now and then? And any insight to the no power from the usb ports?

Thanks for the reply.

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To check the video card, hook it up to an external monitor and see what kind of picture you get. Of course this can be a combination of problems. The no power from the USB ports indicates a bad logic board. If you have another Mac start it up in Target mode via a firewire cable holding down the "T" key and use Disk Utility on the other machine to repair the hard drive.

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