my desktop goes on a LSD trip every few hours

Hi everyone, I'm trying to diagnose a really strange stability issue with an old PC.

System

CPU: Intel Core i3-540

RAM-6GB

Graphics: Intel integrated graphics (no dedicated GPU)

OS: Linux Mint 22.3

This is an old system, and I suspect the age of the hardware may be relevant.

At completely random times, the PC hard-freezes.

When it happens:

The display becomes visibly corrupted/glitched basically a frozen garbled graphical image.

The PC does not reboot or shut down.

The fans/power remain on.

Keyboard and mouse stop responding completely.

The keyboard's LEDs also turn off, so this isn't simply a display cable or monitor problem.

There is no error message, kernel panic screen, or obvious notification.

I cannot switch to a TTY or recover using keyboard shortcuts because the keyboard itself has lost power/response.

The only way to recover is to physically power the PC off and start it again.

What makes this confusing

The graphical corruption makes me suspect the integrated GPU/i915 graphics driver, but because all input also dies, I'm wondering whether this is actually a complete system lockup caused by hardware.