G5 no status light and USB current warnings - anyone seen this before..

Hi,
Just got an old G5 that had not been used in a while...  Pressing the power button boots the system fine..  However, the Status/Power light does not appear...!!!...
After a while the system throws lots of USB Over current messages on the screen even with ALL usb devices removed..  
I have reset PMC and SMU etc...
Anything else I can try - or is it a Logic board prob.. ?
Many Thanks for any tips..
Best Regs Neil

Hi Neil,
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...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/ 
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/ 

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