Strange PC problems. Help please!

[Amadeus]

So I have a custom build PC (I built it about a year ago), and recently, I've been having some odd problems.

-When the PC is asleep, and the monitor is off, if any program starts to do something, there is a loud grinding noise. if I let the noise persist without waking the computer, eventually, the PC will not wake, and I need to reboot manually.

-I get pretty bad framerates for my hardware. For example, I can't even run WoW on medium, or games like Torchlight, a game that requires basically no power to run.

-Sometimes, while playing games, either colored stripes fill the screen needing a reboot, or the game crashes and an error pops up about how the graphics driver crashed.

My build:

AMD A8-3850 overclocked using AMD's integrated tool to 3.2GHz
XFX HD 7850 Double Dissipation GPU overclocked to 975/1250 using AMD's integrated tool
A75F-A Black Edition Mobo
2 HDDs, both sata, 7200RPM, one is 300GB and one is 700GB
4GB RAM (I think Corsair Vengeance)
Windows 7-32 Bit
Hec Zephyr MX750, 750W

 

[bluebob951]

Are the overclocks 100% stable? especially the GPU, also do you have the latest AMD drivers installed?

 

[Amadeus]

Well, to be honest, the overclocks changed practically nothing FPS wise. At all. These problems started occuring before the OCs, and I tried to OC to fix the FPS issues. Also, Yeah, I'm (pretty) sure I have the latest drivers installed.

 

[mysteryos]

Can you tell us about idle/load temperatures on your GPU?

 

[Amadeus]

Not quite sure, however putting 100% fan speed while playing a game has no effect on the FPS, making be believe it isn't the fans