OK if it were me I would replace all the memory with these HERE. Get two of the 2 gig modules and that way they are matching.
Personally I would go with either the Mushkin or Crucial. You would be looking at at minimum of $54.00 plus shipping.Take out everything you have a put these in by themselves.
hey thanks so far.
You have helped me a lot with the problem
I will get the memory replaced with i think Transcend stick
have a nice day...