DPC issues, crackling sound, not sure if solved

I've had my fair share of issues with computers but this might be the most annoying. I suppose the answer must be in there somewhere, thanks for the help, fireberd.
 

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    PC/Desktop
    CPU
    Intel Core i5
    Motherboard
    P67A-G45 (B3)
    Memory
    12 GB
    Graphics Card(s)
    AMD Radeon HD 6800
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