Originally Posted by silverwing65
While upgrading to win 10 the screen has gone blank and has been that way for the last 30 mins, I can see that the cpu light is flashing, should I leave it to see if it is doing what it should
Yep to be honest that is all you can do. if the HDD light is flashing you have to assume that it is doing something. You do have a relatively slow computer and the Win 10 install does just go off on it's own with no indication of what it is doing, well done Microsoft geeks for that one. It could have gone up the creek but you do need to leave it for a good while before you do anything drastic like rebooting the pc. I do hope you backed your stuff up first like I told you you should.
Oh and don't forget to remove the usb stick or DVD after Windows does it's reboot or it will boot from that again and restart the install.