Strange flashing symbols on screen/RAM parity error

[jdubbjr]

I'm running 2.3.4 on an older HP desktop. Came back from dinner and found this on the screen:
Youtube Video

I did a hard shutdown, started it up, and was greeted by a RAM parity error:
https://photos.app.goo.gl/QOPCrKmAtTN8Ka5v2

I took three sticks of RAM out, leaving one 2GB stick in the computer. I added one stick at a time back to the system,
shutting down and removing the  power in between, and everything was fine. All four sticks are back in the system.

So what gives? Any thoughts?

Thanks

[stephenw10]

Looks like a hardware failure, probably bad RAM given the message. Potentially some video card issue.

Juts booting with the DIMMs in proves nothing really. You need to run a few loops through memtest (I prefer 86+ http://www.memtest.org/) before you can be sure it's good.

Steve