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I am still working on my new build 8700k with an ASRock Fatal1ty Z370 Gaming K6. The full story is documented here a long with a complete parts list but there's not much more to it other than "won't post, suspect faulty board".

This board seems to have the same problem as the first one which I already RMA'd: it won't boot, post code "40" which corresponds to "unspecified RAM error". I've tried with two different sticks, and then I bought another 16GB and tried each one. Nothing: just "Error 40". The new RAM is a 2x 8GB DDR4 3466 which I got directly from Crucial and didn't shop around, so as to use their system/parts finder utility. And this time there's no doubt about the read out: it's definitely error code 40, no matter which slot I put the RAM stick in.

At this point it seems pretty unlikely to me that two boards in a row would be RAM-defective, or four RAM sticks. What am I doing wrong?

Here are photos

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  • If you want help we need exact part numbers
    – Ramhound
    Commented Mar 30, 2018 at 0:39
  • Verify the memory is on the QVL
    – Ramhound
    Commented Mar 30, 2018 at 0:40
  • @Ramhound: check the link in the question for a full parts list :-)
    – DMCoding
    Commented Mar 30, 2018 at 11:38
  • Relevant information should be contained in the question body.
    – Ramhound
    Commented Mar 30, 2018 at 11:44
  • @Ramhound: it is.
    – DMCoding
    Commented Mar 31, 2018 at 0:49

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Despite the mainboard BIOS readout indicating a RAM error, it turned out to be the only component I didn't have the opportunity to test: the CPU. Obvious process of elimination really...

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