Ok I have this board http://www.newegg.com/Product/Produc...82E16813131517 and it has worked well for some time and i am using these other parts:

http://www.newegg.com/Product/Produc...82E16819103531
http://www.newegg.com/Product/Produc...82E16820144112 (x 2)
http://www.newegg.com/Product/Produc...82E16814130062

So had it set up and working for some time. Then I decided to make a new PC, and take some parts from it - the HDs and PSU and make a new system. Well i ordered a hd and a psu for it to have two systems. It was working fine but i think the hooks for the ram slots might have come loose. I know if you are using two memory sticks they have to be dual channeled. I put two memory sticks one in a1 and one in b1 and get no post at all. I put one stick in b1 which is what you do if u are using a solo stick - no dual channel and it works fine. The ram appears to be fully in its slow and doesnt seem to feel loose. I am not sure what the problem might be. I got the manual and can upload it somewhere if needed. (its over 7mb)

The links aren't working ... .

Just write down your specs for the better picture ...

mobo:
mem:
psu:
vga:

...

Sorry About that

ASUS A8N-SLI Deluxe 939 NVIDIA nForce4 SLI ATX AMD Motherboard
AMD Athlon 64 3800+ Venice 2.4GHz
Kingston HyperX 512MB 184-Pin DDR SDRAM DDR 400
EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 SLI
Antec Neopower 550W

Ok, seems nothing wrong with the specs ..

Maybe it's just loosen or something. Have you tried to plug each of both memories on a single socket? If both memories working on single socket, then it should be fine.

Try to clean the socket, maybe it's dusty or something.

Ok I have tried the ram in the B1 slot where you put one stick when thats all your using. It was previously working the day before I started this thread. Now it wont. I am positive the cpu ram and graphics card are still good. I am not sure what else to try

Try some RAM that you know is good. Or swap the RAM to another board and see.

could the ram have gone bad like that cause it was working, then stopped working the next day. One of the sticks ive had and has been used for about 5 yrs the other is only a few yrs old.

there's a chance that something like that happened I was actually experiencing the same issue once. But it was not just gone bad without reason. I was cleaning the CPU (boards, case, vga etc) as I always do, and when I started the system it won't POST. I switched the RAM and it's working. I don't know what's wrong until now, maybe I was mistakenly scratch the memory during the cleaning I was not sure ...