My grapicscard might be dead. I have lived with artifacts on my screen for well over 4 years and random crashes where lines cover the screen. A restart usually fixes it but it reappears. Today it suffered the same thing and did this at startup and never booted, but instead just gave me a black screen, I can successfully boot into safe mode and enter BIOS, but not regular windows, any ideas or is my card dead for good this time?