I had a vid card die on me, and replaced it. Had to move the monitor as well for some reason. Still no picture on the monitor after reolacing with known good vid card, though the monitor power light was one.
OH no! I thought. Monitor is dead!
Put another monitor on and was fine.
Was about to take monitor and swap it for a new one, when I felt a rolling switch as I lifted it, and realised the brightness control had as rolling switch right where I lifted it to move it (all the other controls are digital from a on-screen control). So I plugged it in again, rolled the switch, and sure enough had a picture!
That was my latest (but by no means only

) DUH! moment.
I feel your pain, red.
Cheers
Mick