Title sais it all... an old Dell laptop, both modules in all possible combinations modules/slots show errors (memtest86+). Dell service said they'd send me two other modules but I'm quite sure it's the board.
Re: how probable is a failure of two memory modules?
[Re: Joey]
#359363 02/16/1123:4302/16/1123:43
I had two out of four modules fail on my Dell XPS recently. It gave me some weird beeps. Replaced them to fix it. Just make sure you get the exact type of memory that is compatible with your motherboard or it won't boot.