I keep getting black screen (follows with lag), then normal again, and after a few second, the screen went black again, and normal again, and keep repeating. I noticed, sometime it doesn't effect windows components, like the taskbar, or the start menu, so when it black screen, sometime the taskbar, and start menu is still normal, albeit I can't click anything still. I also noticed the problem didn't occurs if there's no movement in the display, like no video, or when I don't scroll anything (moving my mouse doesn't seems to make the problem occurs too) . I can acess my bios with no problem. I would appreciate anyhelp, thanks.