2010-02-07, 08:05 PM
You need to check if your motherboard supports the RAM you're using. Having it only work on 1 or 2 is normal if you don't have any other RAM in those slots. As of it doesn't take more than one stick, I would try looking at the mobo manual first, test out jumpers if needed, but most important of all, flash it with the latest bios if possible. When you say it won't boot, does it at least load up to POST? Also, you can check out forum.desktopreview.com, they usually deal with common problems.