New
#11
One way to isolate a noise is use an empty paper towel tube, one end to your ear, the other to moving parts in the PC. Do you also have case fans? The CPU fan should not stop spinning, rather should slow and speed up.
Some hardware tests to run.
Graphics card test:
Video Card Stress Test with Furmark
Hard drive(s)test(s):
Pick one for your HDD brand or use Seatools.
7 Free Hard Drive Testing Software Tools
RAM (memory) test:
This will require memtest on a bootable CD or USB stick.
RAM - Test with Memtest86+