No signal to monitor

[R3mi]

I was playing GTA 5 and my PC suddenly turned off. Now when I try to boot, there is no signal to the monitor and the PC can't be turned off by holding the power button I have to press the switch on the PSU. I have a feeling this was caused by holding overheating because it was a hot day and the fans were quite loud.

Any solutions?

I have already tried removing the motherboard battery and holding the power button for 30 seconds

 

[Dorosh]

I was playing GTA 5 and my PC suddenly turned off. Now when I try to boot, there is no signal to the monitor and the PC can't be turned off by holding the power button I have to press the switch on the PSU. I have a feeling this was caused by holding overheating because it was a hot day and the fans were quite loud.

Any solutions?

I have already tried removing the motherboard battery and holding the power button for 30 seconds

What kind of processor do you have? I ask this to see if it has built in graphics. I'd pull out the video card and try booting with the built in card (if you have it) to see if it boots. If you don't have a built in, do you have another old card to try? This would tell us if it's a fried card.
Also, sometimes re-seating the card might fix it. Just pull the card out and put it back into the PCIx slot. See if this helps.

Also, what are the PC specs - like how old is your graphics card. Most cards made in the last few years will throttle themselves down if they are getting too hot to prevent damage. This being the case, it's unlikely it overheated.
There could but a number of other issues though, like a power surge for example - may have damaged the card or even another part of the PC.