No, you are not damaging the GPU. Have you gone to power options and not let the monitor sleep?
Ok I've selected sleep - never
But tbh, it's never happens before and I've had it for about 2 years now,
and it tends to happen when you first turn the computer on, it refuses to turn on, and cycles.
But if you disable it then enable/or restart computer, it can turn on.
I'll see what happens over the next few hours, I got a monitor atm so not a big deal if it does broke, they're cheap to replace, thanks!