PowerMac G5 not fully booting

I have an old PowerMac G5 that turns on but no chime, no video, no light above the power button. When I press the power button the light comes on then just blinks twice and goes away. No red lights on the inside. Fans and everything inside seem to be working fine. Ram is good. PRAM battery is good. Cannot reset PRAM because it does not boot to the point of recognizing the keyboard. Anything else I could try?

There is a smu reset switch this worked for me in the past

How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005)

And if no joy the PSU may be gone.

Really hardly worth the expense if it is the power supply. If you look for a second hand unit, if that is the problem, make sure you get the model right.

Tried the PSU also. No go. I just read about a trick of heating up the ram area? It's worth a shot I guess..

So I held in the power button for a few seconds and it made a kind of beep sound. I then turned it off. Push the power button again and I got the chime. Still not fully booting to where keyboard is active and no video. There's also a little red light on the inside that you can see from the front (not the one that comes on when the plastic door is not in place.) Any ideas on this?

Sounds like a dodgy CPU:-


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