I upgraded my mum's HP Notebook (15-r110na - see http://bit.ly/1X0pl9p) at the weekend - Windows 8.1 to Windows 10. Everything seemed to go fine but the next day when I went to turn on the laptop, all I got was a black screen. The hard drive started up, the keypad lit-up and the fans started but the screen was black. I had to restart the laptop a couple of times until the screen finally came to life and I logged into Windows as normal.
This problem keeps happening intermittently though... Sometimes I can turn on the laptop and everything will work fine straight away (although it seems to take much longer to login than it did on Windows 8.1 - it's ages before the login screen appears). Other times, I'll get the black screen straight away and have to force the laptop to restart.
This only started happening after I upgraded to Windows 10.
A couple of other things that may or may not be relevant...
The laptop is plugged into a socket gang extension lead, which is NOT surge protected. A printer and table lamp are also on this extension. A few hours after installing Windows 10 (and the laptop had restarted a few times with no problems), I unplugged this extension lead without flicking the power off first. I then plugged it back in and the table lamp (obviously) came back on. I seem to remember seeing the laptop screen flicker at the same moment. Could I have damaged the laptop somehow by doing this? Did I cause some kind of surge?
Also, when the laptop is just running on battery, it seems to start-up faster than when it is plugged in. Have I damaged the power lead?
Basically, I'm wondering whether the black screen is caused by the Windows 10 upgrade or whether I damaged the laptop when I plugged the power lead back in? The fact that even when I don't get a black screen, the laptop now takes ages to get to the Windows login screen makes me think it's more to do with a driver or something... but I'm now being paranoid! (Incidentally, I haven't updated any drivers/software after upgrading to Windows 10).
Any help would be much appreciated!