Freezing when waking up & strange noise

[paulhobbs23]

Hi everyone

I'm having a few problems with my Imac G5, started about a week ago, my girlfriend did the mac software update, and i think it updated the sleep light or something. Then the mac worked ok all the time it was in use, but when i wake it up from a sleep the whole thing locks up, then the fans go mad.
Now the problems have got worse, it intermittently boots, sometimes i get a grey screen then the little folder with the flashing question mark, i'm also getting a loud static crackling noise when I turn it on that can last a few seconds or a few minutes till the fans come back on.
I've zapped the pram, and reset the firmware but it hasn't helped.

Anyone got any ideas??

Sorry about the long post!

Thanks

[paulhobbs23]

no ideas? diagnostic leds are fine on mobo and it passes all the diagnostics ok, power supply? hard drive? ram? am i the only person with this problem?