Hey everyone im new here....

i did the Belarc thing where it tells you your comp specs:
Specs:
Board: ECS M921LR
1.70 gigahertz Intel Pentium 4
...heres the kicker:
Ive been messin around with stuff in my PC, i decided to clean out the board cuz it was just filthy inside.
Before i decided to play DR., at the POST it would say that i have over 700MB of memory....
i took everythin apart, used rubbin alchohol and an airduster to clean everythin.
Took out the CMOS battery and put it back in, put in my two DIMMS, troubleshooted some stuff i kinda fudged an then i turn my comp on.
now, at the POST it only says i have 256+MB of memory....
now i dont remember how big the additional DIMM was, either 512 or 256....im pretty sure it was a 512. But it doesnt say how big it is on the actual Module.
this is what the profile summary says:
256 Megabytes Installed Memory
Slot 'A0' is Empty
Slot 'A1' has 256 MB
Slot 'A2' has 256 MB
....so whats the dealio? can anyone help?
oh, i tried putting in each Memory Module by itself and powering on the comp...but it only identifies the 256MB DIMM that came with the comp when i put it in the second slot.
i tried doin that with the other one, but it wouldnt boot, id keep getting the beeping when i powered on my comp
ps. Im gonna be askin lots of questions cuz im all new to the customizing the PC and stuff.....[Johnny5]...Input, Input, Input [/Johnny5]