2008 MacBook Pro (4,1) 2.4 C2D powers on with black screen. Already had a MB replacement some years ago and hardly see's much usage for some years now. Observations... No chime, but my sound was muted upon last successful boot Power light stays solid and dim Won't boot into TDM Won't boot from machine system disks Can't run AHT CD won't eject now Safe mode doesn't work PRAM/SMC reset Before this happened I had just finished transferring files from a TM backup after a fresh El Cap install. The machine could've been getting hot because the keyboard illumination was on full-blast for a while before I realized it. Also SMC Fan Control was active with slow fan settings, so it was getting hot. These settings came from a Mac Pro and I always forget to trash prefs, etc after a migration to the laptop. The CPU only showed 70C, so not that hot. The last last thing I did was run a sudo command before restarting and then the black screen appeared. The migration was from a MP using two drives, one OS and the other media, using terminal to soft link the directories to the media drive. I only have one drive in the laptop, so directories were just whited out. So I sudo rm'd the directories. I was just about to copy the folders and files I wanted and then it happened. I'm thinking the terminal lines I entered are just pure coincidence and have nothing to do with this. Fried motherboard...again? Dead MB's won't power on at all. So fried 8600m GT? If so, can you solder a new chip in?