Don't know if anyone has any experience with this, but just yesterday my laptop (HP Paviliion dm3) froze up and wouldn't respond to any mouse or keyboard inputs. I powered off my laptop and turned it back on, only to find that it now doesn't boot up and I just get a blank, black screen. I googled this problem on my phone, and the most common solution seems to be to remove the battery, unplug the power, hold down the power for 60 seconds, then plug it back in and turn it on again. I tried this several times to no avail. I'll probably call customer support at some point (though my warranty's expired), but I thought I'd try asking here first.