Bsod error: Click sound then blue screen; ntsokrnl.exe

Hello,
I am new here so bare with me. I've recently been getting the BSOD errors 0xF4 and 0x7A. When I look up the error it says it's caused by ntsokrnl.exe. This seems to be associated with my graphics card. I've noticed many other people getting the same kind of errors, and I've tried every method of find the solution possible. Running Hard Drive scans, uninstalling drivers, antivirus, nothing seems to work. If it helps, right before it BSOD's I hear a click sound and a winding up sound from my computer (It sits next to me). It sounds like a hardware issue, however I don't know where this sound is coming from specifically in the computer.

My specs:
Intel Pentium Dual Core 2.5ghz
Nvidia GT 220
2x2GB eMachine Memory 667Mhz DDR2
eMachine EMCP73VT-PM motherboard
WD Blue 500GB
WD Black 120GB
PSU Logisys 575W
1600 x 900 20" Hp monitor

Please help!