My aged Dell XPS l502x has suddenly stopped booting. Occasionally it starts for a few seconds giving distorded blue screen with something written in bold white but alien language. I think one or more hardware part of my laptop has malfunctioned but I can't figure out which one/s and how. Are there any steps that can be tried by self to test issues with Graphics, Processor, Motherboard, Harddisk etc which may have misbehaved? Or do I need to go to repair shop?