[SOLVED] Monitor suddenly not recognising any input (Solved - pending a wait period)

[tek36]

I recently got my computer fixed up. It was upgraded partially for some time until I recently had it sorted. It's been working fine for the last few days. Now suddenly it won't come onto the monitor. It recognises that the cords are there, but there's no signal getting through. It was on Div. It also has Sub-D, doesn't help. Is there anything aside from getting inside it that might do something. Tried the obvious things like cables, etc (except a new one as I don't have another).

 

[tek36]

Seems to be good. Was told to unplug both power and monitor and hold power button for 30 seconds. Did the trick. Don't know why it decided it didn't want to know which output to use. Hopefully it's all good now.