1mb =1024bytes so 128 X 1024 is 131072.
Normally if you have bad RAM you get a series of beeps on start up, MOB manual tells you what they mean.
Is the memory you have put in compatable with your MOB, does it take pc 66 or pc 100 or even 133? Are you using 72 pin sims or 168 pin DIMMS if it is a SIMM then normally you have to fit them in pairs. 2x32 in banks 0and 1 2x32 in banks 2 and 3 etc.
After instaling RAM it is normally a good idea to go to your BIOS on bootup and then exit and save. What happens when you swop the memory around do you get the same results.