Hi my computer has been running fine with 4 sticks of ram since i built it, but has stopped loading windows so i removed 1 stick of ram and then it worked. But when i put back in the stick of RAM it will not start up Windows. My motherboard is a Sabertooth z77 and RAM is just normal Corsair vengeance ram . ?
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Sounds like you could possibly have a faulty stick of ram , return the ram for RMA and you should get a replacement.