I have two modules in my laptop. I have tried all sorts of combinations - swapping slots, try only one module in idifferent slots. But nothing helps. I have also tried modules from a different laptop (which finish MemTest86 on that laptop), but again they too fail on my laptop. I have tried my memory modules on a different laptop and manage to run MemTest86 successfully on that other laptop. Surely, can't be the modules?
I have also tried running HDTune Error Check since I started the thread. I got no errors in that test.