Currently Being ModeratedMay 7, 2013 6:04 PM (in response to SadieToo)
Forgot to say that I have pulled the power cord for 15 secs and then plugged back in - nothing happens. Also tried another power cord. nothing happens. The Mac makes no sounds or lights when power on is pushed.
Currently Being ModeratedMay 7, 2013 9:02 PM (in response to SadieToo)
OOPs, you marked it answered/Solved, might repst to get more helpers looking at it.
Is there a Red LED lit on the logic board?
If not then there is no 5V DC to start up.
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...