Weird RAM slot problem! Help please!

[wizdum]

Okay I finally got my pc up after a month but now I have a weird problem. I can only stick my pc2100 cas2.5 unbuffered ram in the last slot. all slots support registered/unbuffered ram. I have the latest BIOS. it's a kx7-333r. I used to be able to put the RAM in any slot? any suggestions? if i put the ram in a different slot the mobo lets out a continous, beep, beep, beep, etc... could the ram slots be bad maybe?

thanks..

 

[ChampionAtTufshop]

are there any error beep codes in the manual listed?
long endless beeps i believe are dram errors, so it is possible that the other dimms are bad

 

[wizdum]

yeah that beep code means the ram is bad but the ram works fine in the last slot?