What could be the possible reasons for the computer to suddenly go black screen?

My computer randomly goes to a black screen with no warning, and I cannot figure out why this keeps happening. The screen goes completely dark while the system seems to still be running, with fans spinning and lights on, but nothing responds. I have to hard reset to get back in. I have already checked my monitor and cables, and they appear fine. Could this be a graphics driver issue, a failing power supply, an overheating GPU, or maybe a problem with the motherboard or RAM? I would appreciate any advice on where to start diagnosing this frustrating issue, as it occurs at random intervals even during light tasks like web browsing.