ASUS A8N-SLI Premium 939 NVIDIA nForce4 SLI ATX AMD Motherboard

This innovative board takes full advantage of SLI technology, supporting a maximum of 4 GB DDR RAM

So its not the motherboard so as refereed to earlyer i would check the slot and also check that you running memory of the same speed eg ddr800 or ddr1024. it may cause and issue on certain board HOWEVER usually the board will default to the slower setting.

Another thing you can do is go in to your bios and select the FAIL safe setting to See if it works the this is effectively running your memory at the slowest speed possable. after you know it work you can increase it bit by bit . i got caught buying ram on ebay from god knows where it was ment to be ddr800 but i Had to slow the ram timing down to make it work. but that machine still runs fine and its not that slow.
you can also change the maximum memory the computer thinks it has. in control panel- administration tools - system configuration - select the boot tab - then set the memory to the amount you should have. these INSTRUCTION are for vista. so it was only an idea maybe x64 professional the same function, Quote from: Peterwolfe on January 17, 2009, 04:07:50 PM

uh, that kind of an answer REALLY helps out ....by the way I have been using TwnMOSS a lot of years without any problems...

So its not the motherboard so as refereed to earlyer i would check the slot and also check that you running memory of the same speed eg ddr800 or ddr1024. it may cause and issue on certain board however usually the board will default to the slower setting.

uh, that kind of an answer REALLY helps out ....by the way I have been using TwnMOSS a lot of years without any problems...

DDR266 = PC2100
DDR333 = PC2700
DDR400 = PC3200
DDR2-400 = PC2-3200
DDR2-533 = PC2-4200
DDR2-667 = PC2-5300
DDR2-800 = PC2-6400
DDR3-800 = PC3-6400
DDR3-1066 = PC3-8500
DDR3-1333 = PC3-10600
DDR3-1600 = PC3-12800