+ 0 Votes Could be a couple of things robo_dev 1 year ago On a laptop that won't boot, first thing would be to unplug/remove anything that can be removed. Battery, drives, memory, anything else plugged in. Sometimes a failed component can stop it from booting. If possible, try a different external power supply as well. If a laptop won't pass POST with all things removed, then there's not much more to do. At that point it's either the motherboard, processor, or some issue like a display or backlight issue.