Constant PC lockups/freezes

[Parlaaay]

Built my own PC about a year ago. It has froze in the past and has given a few BSODs which didnt bother me at first but now it does. I sent in my GPU thinking that it was the problem. Problem still persisted. MemTesting my RAM atm. CPU and GPU temps are pretty decent. No overheating whatsoever. ALL drivers are up to date. No dump files or any type of log was created in event viewer or minidump after any lockups/freezes. PSU is a corsair 750W gold certified. Tried reformatting W7. No solutions still.. Dont know if the hard drive has gone bad or if its the mobo, assuming its a hardware problem.. Any ideas? It usually happens when I game or watch YouTube videos. I have
16gb RAM and tried using 2 dims at a time. Still froze. Please help

 

[hefox]

Please give us the list of all the hardware.

 

[rogigor]

If reinstalling didn't help then it's probably something with your hardware. Try using one RAM stick at a time to see if there's the problem. Use hdd doctor or other program to test your HDD - maybe it has bad sectors or something. Run CPU stress test like prime.