W520: all 4 memory sticks defective, how can this be? Mobo-issue?

G'day
I have a W520 i7-2630QM. In addition to the factory installed Samsung memory chip I last year installed three Kingston 4GB sticks, for a total of 16GB. After having done a factory reinstall, I ran the hardware check tool from the Lenovo toolbox. It told me a memory stick was defective. I then ran W7-64 memory diagnostics, which found nothing. Then I ran the Memtest86 - 4.20, which is still running but to my surprise at 43% already tells me *all four sticks* are defective(?)
I have made a picture of the screen (sorry for the flash light, couldn't seem to disable that on my wife's camera):
http://imageshack.us/photo/my-images/51/img6025k.jpg
How is it possible that 4 sticks all at once go bad? Normally its one, now it is 4? Could this be a defective mobo or something?
Thank you in advance for any suggestions :-)
Bye,
Moderator note: garbled image URL fixed. (and next time, turn off your flash )

Hey Sjaanbanaan,
You can test your memory cards one at a time and see which card works on the W520. The problem with doing them in pairs is that wont know which card is faulty.
Here is a link for that can walk you through doing a memory test:
http://support.lenovo.com/en_US/diagnose-and-fix/diagnose-by-symptom/detail.page?&LegacyDocID=MIGR-4...
Best Regards,
Hiro
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W520: all 4 memory sticks defective, how can this be? Mobo-issue?

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