IMac 24" display suddenly went off, it's not working anymore!

Hi,
I was working on my iMac then left it for a while, came back to see the display is all off.
I've restarted the machine, there is sound and I can hear the notifications and volume sounds, but the display is still black.
I've tried unplugging it and other cords, resetting whatever I could....nothing!
is this a common problem? how can it be resolved?
Thanks!

Sounds like either the display or the display backlight went out. Unless it's under an extended warranty, it's probably not worth repairing. If you have an adapter for an external display, you can continue on using it that way, but otherwise probably time to be looking for a new system.

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