Which software at repair?

The day before yesterday I brought my laptop to a computer repair service. He has inserted a USB stick and started a program that told him of 2 RAM modules would be a defect. RAM swapped laptop is running great. My question is, what was this program?

Is called Memtest

Thank you. Is there still such software for other hardware?

Get Manjaro-Linux from this page

https://osdn.net/projects/manjaro/storage/xfce/18.0.3/manjaro-xfce-18.0.3-stable-x86_64.iso/

burn that as ISO on a DVD or prepare it with a USB stick (but not just copy, as such a program for Windows means I do not know, but can be found).
Boost your computer / laptop with it and you will also get an entry for Memory Test.

With such a Linux live system you can also do other repairs.

Why a complete distri? Even with xfce so that the inexperienced user is guaranteed not cope? - Better the original: https://www.memtest.org/

Memtest86+ was already called.

And yes, there are other software that tests or analyzes other hardware.
But it does not have to be started separately via Boot-Medium. It runs normally under Windows.

For example, that would be https://crystalmark.info/en/software/crystaldiskinfo/, which keeps track of the health of your hard drives.

But there are also many other specialized programs - too much to list here.

Nobody has to install this. Other distributions offer a live system separate from an installation ISO. Here is everything, MemTest, live system and installation system together at just 2GByte.
What should "still with xfce" mean? Since KDE released the KDE-5, that's almost useless.

Nobody has to install it - but the installation medium is included? I find contradictory. For what you need to "NEN" to save a PC, a GUI really needs me synonymous even more hazy?

By the way, instead of KDE, take Cinnamon or n Mate…

How do you become a "community expert"?