Memtest stops at a blank screen at boot

[Dimitri001]

I created a bootable USB and set the computer to boot from USB, but when I restart it it just goes to a blank black screen with the little dash ( _ ) at the start of the screen. I can hear the HDD working hard, but nothing is happening and the red light indicating that the computer is working isn't blinking. I waited about 5-10 mins, but nothing happened, it's just stuck there.
Any idea what the problem might be?

[David (PassMark)]

What version of MemTest86?
Does your computer support UEFI BIOS?

[Dimitri001]

I'm using the latest version of memtest.
I'm not sure my MB supports UEFI, I have a pretty old one - MSU MS-7641. I don't know how to check. Certainly right now my bios mode is listed as "legacy".

[David (PassMark)]

I couldn't find any motherboard with that name. So I think you have the model number wrong. But check the manufacturer's web site, once you find the model number.

[Dimitri001]

I couldn't find any motherboard with that name. So I think you have the model number wrong. But check the manufacturer's web site, once you find the model number.

Oh, geez, typo! It's MSI, not MSU. Sorry about that.

I believe that's this MB: (I got "MS-7641" from msconfig, apparently it corresponds to this model)

https://www.msi.com/Motherboard/support/760GM-P34-FX

I'm not sure how to check whether it supports UEFI, where would that be listed?

[David (PassMark)]

From the screen shots I found online the 760GM-P34-FX looks like it has BIOS from 2005. Which was before UEFI.
Which means you need to use V4 of MemTest86 as that was the last BIOS compatible release.

[Dimitri001]

Thank you!