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The power grid where I live is unreliable, and we frequently have interruptions (and presumably surges). I usually have a UPS protecting my desktop computer, but my prior UPS developed a fault and I stupidly ran my computer for 2-3 weeks on only a belkin power strip (which claims surge protection, but tbd).

In any case, the computer started developing strange issues that initially manifested as USB devices not being found. I tested the USB hubs and devices on another computer and found no problems.

I decided to reinstall the OS, just in case something had shaken loose in the drivers. UEFI was unable to find the boot partition, and I couldn't boot.

On a whim I ran memtest86, and sure enough I found 100% errors. I tested each of my four DIMMs individually, and in different memory slots, and in each case am getting a 100% error rate.

So, is it more likely: a) That the motherboard is fried in some way b) That the DIMMs are bad

Buying hardware isn't exactly fast here. Also, my CPU is an i7, and there's a diminishing number of motherboards around that'll fit it (I believe) so motherboard swap may imply a new CPU, which'll be spendy.

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    It can be both and only trial and error can determine where the fault is. Commented Dec 19, 2021 at 20:27
  • just a suggestion, a power line conditioner might be more useful to you than a ups, though in your situation I would use both. I run mine after the ups.
    – wb3
    Commented Dec 21, 2021 at 5:40

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First, check that all parts are seated correctly. One RAM stick slightly askew in a socket can mess up memtest.

Second, have you made a bootable USB device, using Ubuntu Live, Ultimate Boot CD or one of the many alternatives? Boot from USB and run the memory test from that, eliminating the HDD and/or OS as the issue. For example, on Ubuntu, run memtest86+.

Also, if you can borrow a similar PC to test the RAM, check the sticks there: It seems unlikely all would be completely bad. If they're OK, then some hardware on the motherboard, or the power supply, is the issue.

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  • Yeah, I was running memtest from the USB key. I will do the other checks you suggest - thanks.
    – user717847
    Commented Dec 19, 2021 at 22:00

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