iMac G5 won’t boot (loud static noise)

[EricNau]

Tried pulling my iMac G5 (als) out of storage to see if I could get it running (probably hasn’t been turned on in 5 years, but was working well back then).

It powers-on (fans, optical drive, and HDD all seem normal), but it does NOT chime and immediately emits a loud, constant static from the internal speaker. (Putting something in the headphone port doesn’t make a difference.) Power light remains steady-lit, and screen remains off.

I’ve tried resetting the SMU (button on the logic board): computer responds, but starts-up the same. Logic board LEDs 1 and 2 light as expected, but #3 (video) is off.

Any ideas? I can’t seem to find info on the loud static. Many thanks!

 

[Roman78]

What iMac is it? The first series (those with the back cover) had problems with capacitors. First on the logicboard it self and some in the PSU.

 

[EricNau]

ALS model (pre iSight) so I believe my machine would fall into that category indeed. But would a bad capacitor cause loud static out both speakers?

 

[Roman78]

Could be, but i suppose the badcap is in the PSU. But they are easy to fix, just replace the caps.