internal power button works, external doesn't

[memphismac]

I've got a 6-year old iMac G5 that has served me well.

Yesterday, it flipped out, giving me some weird colors before ceasing operations.

When I re-booted, it gave me some old colors, turned the power light off and just hung on a grey screen.

I followed the excellent Apple instructions here - http://support.apple.com/kb/ht2173 - and I've found that it boots just fine from the internal power button. But when I put the cover back on and try the external power, no dice.

A few years ago, the Genius Bar did some sort of recall/electrical fix on it. A blown capacitor, I think.

Any ideas why this is happening?
And what, short of buying a new iMac, can be done to fix it?

 

[teal]

Same issue

I'm having the same issue. I had a local technician look at it, he said he resoldered a capacitor (which I doubt). He said it booted and worked.

The internal button boots the system, but the external button doesn't. The only info I can find online tells me to take it to apple. Apple said I need a new power supply, which was not the case (obviously, since the internal button works). Any ideas? I'd love to have this machine back up and running.