If the RAM worked in the past and works on another PC, it's much more likely to be a motherboard issue than a RAM issue. In that case replacing the motherboard (and depending on how old it is, also the CPU and the RAM, which amounts to a totally new PC) would be the solution.
If i put anything in the RAM slots 2 and 4 then my PC doesn't boots.
When if put the RAM in slot 1 and 3 then my system is on for few minuets but when i play a game or watch a video then i get blue screen.
I checked my RAM on my friends PC but they work fine there.
I cannot figure out what the problem is and how to solve it.
My build is AMD Phenom2 3.4Ghz, 2x2GB GSkill RAM, ATI 5870 Graphics.