BSOD when loading games

Hi, I need help here. My pc have been getting bluescreen when i loading the games. it didnt happen before. it happen just after i remove all the components from the case because i make some new painting on my case. after painting is done, i reinstall all the components, turn it on and it works fine except when loading the games. i play codbo, skyrim, w.o.t..is it possible causing by graphics...