Hi, is it the Plastic ADC model or the Aluminum DVI model?
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems...
See which one your G5 has...
Have you done a PRAM reset, CMD+Option+p+r...
In fact, do 3 in a row, takes a bit of time.
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
Earlier G3, G4, G5 models...
Also, have you blown the dust out lately? Especially the Video card, maybe even reseat the Video card?
Well, this is really strange.
I zapped the PRam, and that seemed to fix the problem.
The monitor worked for a couple of weeks.
Now, it's back to not coming on when the computer boots.
Any more suggestions?
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