Need advice with'randomly' hanging/freezing PC.

Hey guys, first post here and I was just looking for some advice on what might be going wrong with my system. My PC freezes at seemingly random times; it can be playing a game, watching videos online or even just displaying explorer. The PC stops responding and often I hear a buzzing from my speakers (not the tower), I have to force restart and then it also has problems restarting. I get asked to do either a startup repair (which just does a restore or sometimes crashes itself) or to start up windows normally, which can take anywhere from 1 to 8 or so tries to correctly boot. Sorry for the rant, I'll post my specs below.

Motherboard: MSI 770-C45
CPU: AMD Phenom II X4 810 (with AKASA heatsink) ~25*C
GPU: Sapphire HD 6750 1GB ~32*C
RAM: 2 x Micron 800MHz 2GB DDR3
HDD: Seagate 250GB
DVD-R: Sony Optiarc
PSU: 600W (can't check the brand right now)
OS: Windows 7 64bit

I've tested the RAM with the memory diagnostic built into windows which comes up fine, I can't think what else it would be. thankyou for any help given.
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More about need advice with randomly hanging freezing
  1. I have the same problem.

    Sapphire HD 6750 1Gb <-- sometimes flickering screen on top in 3D application
    Windows 7 64bit
  2. Me too D:

    OS - Win7 Home Premium
    CPU: i7 3930k
    RAM: 16Gb Corsair Dominator
    GFX: Sapphire Radeon HD 7950 OC edition
    Mobo: P9X79
    PSU: Corsair AX1200 Gold
    HDD: Seagate Barracuda 1TB (Ive got more, but this is the one my OS is on)
    CPU-Fan: Noctua NH-D14
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