I have tried all past post and thread troubleshooting methods (unplug, remove battery, hold down keys for 12, 20, 60 seconds, tried starting up with screen at a 45 degree angle) don't have a solution yet. I have an Acer Aspire 5552-5619 ( i know ancient, but up until now it has been very good to me) and it powers up but no screen just blank cannot get up bios or anything any suggestions? (i can hook up an external monitor, but need main screen to work when out of my home)