Corbin

I recently decided to add some more RAM to my computer.... I have 1g
right now, and I decided to add 1.25 more (2x .5g's and 1x .25g) I have four dimm slots and my original RAM is in Dimm B1. The other three sticks I put in the other three Dimm slots (Dimm B2, Dimm A1 and Dimm A2) The Dimm B2 works, but the other two Dimm slots arent reading the other two sticks, I know the RAM works, but could it be the M/B or do I need to go into BIOS or something to get it to read the RAM? Or did I put them in the wrong spots? Any input will help ..... my stats for my computer are below......

Thanks!

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Thermaltake Tsunami case
BFG Tech 7800 GT
Asus A8V-E Deluxe M/B
AMD X2 4800
2 GB RAM
Seagate Barracuda 160GB Hard Drive
Seagate Barracuda 250GB Hard Drive
Liquid Cooling System

-Corbin-