Tell what psu you have......make and model.
When's the last time you gave the innards a good cleaning with some compressed air?
Don't forget the psu a few shots of air from both directions.
I'm suffering from this problems in my PC
sometimes when I'm gaming, the PC freezes for like five secounds in the middle of the game and makes this loud static noise from the speakers and then it restarts.
and sometimes the screen goes black for seconds when I'm gaming or watching YouTube or simply just working on my browser, and then it comes back again saying that "Display driver stopped responding and has recovered"
and sometimes my PC just restarts randomly.
I tried reinstalling the GPU driver, tried old versions, but it didn't work.
Windows 7 Ultimate 64-bit SP1
AMD Phenom II X6 1090T
10.0GB Dual-Channel DDR3 @ 666MHz (9-9-9-24)
ASUSTeK Computer INC. M4A785T-M (AM3)
2048MB ATI AMD Radeon R9 270x (Sapphire/PCPartner)