What does 'verify pool data' mean

upgrading old pc vista. bios recognises extra ram but doesn't pass 'verifing pool data'. without extra ram works but adding same ram sticks pc won't pass bios post.
recognises other ram stick in one slot without original ram no matter what slot on moth board, but adding exactly same together to boost ram still won't pass 'verify pool data'
locks up and won't go into windows
Asked Mar 21, 2016

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