Not seeing other stick of ram

Hello
1. Check that ur M/b Supports that much capacity
2. Check the both sticks are of the same company and mb

If it supports do the following
1.  remove all the rams inside
2. Place the newly brought ram and restart the system
3. Check the system work perfectly
4. shut down the system and place the another ram and restart the system
5.  if it not works interchage the two rams and repeat the 2-4 steps

Let me know if your problem is solved and rate me as FIXYA!

thanks for getting back to me so quickly.
my model supports 2 gigs of ram?
i know the slots are ok, cause i tried different memory and reads in both slots"