PC beep on startup, RAM problem

Hi guys,

im sorry if this has been brought up before, but i was just trying to upgrade my PCs RAM. I ordered some new 512K RAM from ebay and when i plugged it in and restarted my computer, i got continuous beeps and nothing comes up on monitor. I tried removing the new ram and plugging in my old ram (which previously worked), but same problem. Ive tried using all of the 3 slots but no use.

I tried using my old ram in a different PC and it works.

I did some research and the beeps i get are 1 beep immediately after start, and then 3 continuous short beeps. I read on another forum that it means "Beeps 1-3-3-3 2A Clear 512K base RAM!"

After some investigation i found out that the RAM i got from ebay is DDR2 RAM while the RAM i previously had was DDR. So maybe by plugging in wrong RAM in wrong DIMM has caused this, and messed my system up.

Have i messed up my RAM slots ??

Does anyone know anything about this or how i can rectify it. Any help would be greately appreciated.

Regards,

Sunny