TV monitor

[Excalibur]

If you dont have another monitor to test with, try unplugging the screen from the computer and then connect back and see if it gives an image on the screen.
Sometimes when a screen fails, it will briefly come on with an image and then go blank, you could also try powering off the monitor and then turn back on.

Tried unplugging, rebooting, power off/on and at various times. Might have to concede screen has failed if that's a common way they go.

Found my spare monitor but it's VGA only. Am borrowing the one from my workstation which is DVI with a double ended DVI lead.