hi
it could be your graphics card have you got access to a another you can try?
have you overclocked youre graphics card ? id so put it all back to normal ?
or you might have to reformat reinstall the operating system sound like its your graphics card to me though (try a different graphics card first ?)
could allso be corrupted drivers ? uninstall the graphic drivers reinstall ?
cant be youre ram because if it was your computer wouldnt even start up
