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I have seen memtest fail on detecting faulty memory in the past (admittedly, it's rare for memtest to be wrong from my experiences). Any hardware troubleshooting process with PCs is to keep it simple - i.e. the process of elimination.
I've seen people fail to spot things in the industry (20 years building my own PCs, 15 years working in IT) - for example, my last job, we had an older server that wouldn't boot. 2 other guys looked at it, and the boss, and gave up. I had a look at it and noticed popping caps on a daughterboard. Did some research, it was a known issue with this Dell server board, found a 2nd hand replacement for said daughterboard, told the boss, he went ahead and bought the 2nd hand part on my advice, we got it, swapped it out, and voila - Dell server started working again.
3 other people missed this. All of them pretty experienced and knowledgeable.
Always keep it simple. Linux is far better with hardware than any form of Windows, definitely worth testing the rig with that imho.
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