I had an initial fault with Windows 10 where the start button disappeared so to switch it off I used Alt/F4. That brought up a small screen that allowed me to shut down . The next time I tried it I looked at a couple of options and chose sleep mode...Big mistake. I cannot wake up the screen at all, the computor itself will switch on and off mit the power switch but nothing appears on the screen, it is blank. I am therefore using another computer to post this. Anyone have any Ideas?? I have tried hitting various buttons on the keyboard to no avail. Thanks.....Jonem