So my brother's started having this problem, whereby when he wakes his PC, the monitor won't come on and he has to hard reboot. It's only started doing it recently as far as I'm aware (I'm sure he would have mentioned it otherwise) and it's been working OK since I built it for him until now. Certainly he won't have updated the graphics driver (onboard HD4250 on the Asrock board, as I recall) by himself. It seems to quite random whether the monitor will wake or not as well.
He's up to date with Windows Updates except for IE11, which won't install properly and just ends up restoring/undoing the Update after a couple of reboots but that's another problem.
He's also finding his PC is on in the mornings after putting it into standby before going to bed but that's yet another issue (I get the impression that when this happens he is generally able to wake the monitor).
Are there any files I can gather with a batch file that he can run after hard rebooting and then e-mail me to me, which will show what the problem is? I can remote into his PC to run diagnostics but obviously can't see what's happening with his monitor when puts the PC into standby.
I actually had the same problem some time ago with my own PC but I can't recall if I managed to fix it or just gave up and reinstalled Windows, which I really want to try and avoid this time.