I suspect some faulty RAM and wanted to test it with Memtest86. I'm using a bootable Ubuntu 20.04 USB stick and choose the "Memtest" option from the boot menu.
Unfortunately the test freezes after 5-6 sec.
I've tried this on 2 different systems and no luck. One is a brand new Ryzen 3900XT CPU with ASRock B550 Extreme4 Motherboard And the other is an Intel Xeon E-2176G CPU with Supermicro X11SCA-F motherboard.
The RAM is ECC RAM. I have 4 sticks and tried testing them 1 by 1 by physically removing them from the motherboard.
I know there are some motherboards that have issues, so I tried the failsafe mode (press F1 on startup) and also tried the single CPU mode by entering config with letter "c" before start.
It appears there is now no way for me to test the RAM. Any other ideas?