EDIT: Nevermind! In an embarassing example of Ockham's Razor, it turns out last night I was a complete idiot and I plugged the HDMI cable into the integrated GPU instead of my actual one. Please close (if not delete) this thread, sorry.
I have a desktop with Windows 7 on it, and I use a Hannsg HL226 HDMI monitor with it: have been using it for years with no problems, until today.
I had to restore a separate desktop computer to factory settings, so I brought it home, unplugged mouse, hdmi cable, keyboard, wifi receiver and power cord from my computer to plug them on this other computer and do what I had to do: everything worked fine.
Once I was finished, I put everything back as it was before and, surprise, my monitor won't cooperate with my computer anymore, showing "no signal".
Without the screen working, I typed in my password and asked a friend to message me on Steam, which yielded the notification sound, so my pc and all the other components are working just fine.
I tried unplugging and plugging the monitor a couple of times to no avail.
I tried unplugging it, holding the power button for 10 seconds, and pluging it in agAin, but nothing happened.
The user manual of the monitors shows no sign of a way to reset it, all I can do is open a menu to choose between VGA, HDMI etc., which is set to HDMI as usual.
I do not currently have access to a VGA cable for testing.
What is going on? What can I do?
Edited by reverse, 04 September 2017 - 08:43 AM.