well ive been playing minecraft, then some random hazy purple goes on it and freezes my computer but then randomly restarts my laptop and goes to normal desktop screen. but every time i open any game like starcraft 2 it does the same thing and now i dont know what to do? got any help for this?

Probably your VGA. Try disabling your graphics card at Control Panel and run any game with only your onboard video memory. If the purple screen still happens it could be an ram memory issue too, but that's less likely.