Hello! My brother has been using Dell's Precision M4500- laptop for few years now without any problems. However, recently it has started acting up. Laptop's display shows BIOS and Window's booting animation just fine, but then screen goes completely black. He has force-rebooted laptop a few times to get it working, but now that won't work either. Image shows up to the external display though. The laptop has i7 CPU (can't remember the exact model number) and Nvidia Quadro FX 880M GPU. I have disassembled laptop several times now and cleaned everything inside. Is there anything I can do to safe it?