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Have you checked to verify that your RAM is fully seated in the DIMM sockets?
I had this situation once with a friend's computer. After removing and the re-seating the RAM it was then fully recognized by the system Sometimes a RAM stick will not seat properly and can be askew just a tiny bit causing issues.
Did you verify, as cybercore suggested, that you RAM is a matched set from the same manufacturer? Have you checked the RAM & DIMM settings in the motherboard's BIOS to be sure they match the RAM stick settings?
One thing I have found the hard way is that sometimes with new motherboards, the DIMM sockets pins are fairly stiff when mounting RAM. Sometimes inserting and removing the RAM sticks 2 or 3 times will help solve the seating issue.
In addition, I recently discovered a handy product called: DeoxIT Gold electrical contact enhancer. It comes as a spray or liquid and once the contacts are treated, the cards plug-in much easier and the contacts are enhanced electrically. It even acts as a lubricant allowing easier insertion of RAM, PCI-E and PCI cards. Also SATA cable connections, etc.
It is used and highly endorsed by the major electronic and aerospace manufacturers too.
This is the version I use:
DeoxIT® GOLD, #GN5MS-15
Superior Conditioner, Lubricant & Protectant for Gold Metal Electrical Connections
NEW . . . DeoxIT® GOLD GN5 Mini Spray
(formerly ProGold), 5% solution, 14 g, non-flammable, quick dry - non drip and safe on plastics!
(Applications = 150 +/-)
Contact Enhancer & Protector - Maintains New System Performance!
Part No. GN5MS-15
It lists for $12.95, but I got mine on eBay for $4.50 plus $3.00 shipping for a total of $7.50 !
What I do is moisten a cotton swap (Q-Tip) and then treat the electrical contacts that way. Saves on over-spray and extends the usage so none is wasted.
I highly recommend this product!
http://www.caig.com/
