I have a Dell 3520 and have the same issue. But, I've been using Windows 10 for about 2 weeks. Everything was working fine until I did a Restart one morning and I get a blue Windows screen almost immediately after the Dell splash screen with some error message and it did an automatic restart before I could see what it said. Second time, the same thing again but after rebooting again, I get just a black screen and no Dell splash screen. The power light comes on and the disk usage light flickers a bit then ....nothing. It just sits there fat, dumb (and not happy). I've read some of the replies here and will plan to try some of the suggestions (thanks for the input people). I know I upgraded the system BIOS recently, but not sure what version I was using before the crash. I did see a statement issued on Dell's website that says the 3520 has NOT been tested for Windows 10 so I guess we are taking are chances. Got a new laptop on the way, but in the meantime, if I ever do get the 3520 up and running again I'm going to reload Windows 8.1 and keep it as such.