Spent 4 hours chasing a phantom short in a laptop that was just a bad BIOS setting
Had a customer bring in a gaming laptop that wouldn't turn on at all, no lights, nothing. I spent the first hour checking the usual suspects, the power jack and the main board fuses, all good. Then I pulled the whole thing apart, checked every rail for a short to ground with my multimeter, and found nothing obvious. I was about to order a new board when I decided, as a last ditch effort, to pull the CMOS battery and let it sit for 10 minutes. Plugged it back in and it booted right up. Turns out the BIOS had somehow corrupted itself into a state that looked like a dead short to the power circuit. Has anyone else run into a 'dead' device that was just stuck in a weird firmware state? What's your go-to reset trick before you start ordering parts?