Hello, I'm new here and I have a question /Sorry for my bad english/ so I bought an old GPU for about 1 dollar It was a PowerColor Radeon HD 5550 1Gb and then after some cleaning I install it in my old computer it's a Pentium 4 computer hp dc7500 comvertible minitower I installed the driver but the problem is when I run a game the GPU works great but when I use the computer for surfing internet or something that doesn't need a big GPU power ,my computer return a black screen for about 5 seconds then return normal this is so annoying I searched in internet but i didn't found something , shoud I change thermal paste cause it was dead