WIndows 7 & a 8800GTX that doesnt want to goto sleep (Very loud)

Hi again,

I made a post a few weeks back about my system going into Sleep mode and my Nvidia 8800GTX screamed like a banshee (the way it does when you dont plug in the 2nd molex)

And shortly after this my PSU packed in, and was question marks over a motherboard frying too.

Anyway a few weeks on, ive had a replacement PSU arrive & ive had the motherboard tested by overclockers.co.uk, rebuilt the system lastnight paying special attention to making sure everything's assembled correctly.


Booted up, no problems, 30-45mins later the system goes to sleep, graphics card screams again.


A few people have said its fan thing, im sure it isnt, this sound is constant/instant & actually woke me & the girlfriend up at 3am wondering if the house was on fire, wasnt til i went downstairs that i noticed it was the PC.


So im running out of ideas, and the fact my PSU went pop last time during this im kinda scared to leave it on unattended atm.

Does anyone else have any idea?