Comper enters powersaving mode HELP PLEASE

Hey guys just thought illd give it a shot see if anyone here has some solutions.
Okay so basically when I’m using my pc after around an hour or so maybe sooner If I’m gaming my pc will jus enterpowersaving mode, this is whilst I am using it ofcourse (my screen goes black saying powersaving mode).. I have recently had my pc fixed as my motherboard broke and i have replaced it with a ASROCK g41m-vs3 r2.0.
Anyway I’ve tried many solutions I’ve turnt all the options in windows off and bios, I’ve removed and replaced CMOS battery, I’ve removed my graphics card and tried the on board card, I’ve reinstalled windows(clean) and I’ve tried another monitor also. Now I’m out of ideas.. Hope someone can help me!
PC specs are: Processor Intel(R) Core(TM) 2 Quad CPU, 4gb RAM, Windows 7 64 bit, ATI Radeon HD 4350 series
Answer #1
I had a similiar kind of problem with my lenovo workstation…fixed it after a bit of hassle with the CPU power cable .
Answer #2
So u replaced it?
Answer #3
er..no,just pushed it more firmly in place
Answer #4
hmm ill open it up and have a look again but i dont think this is the problem but thanks i shall let you know if it did work