Solved: New RAM not recognized - removed it now the old RAM isn't recognized

Howdy,

I recently added two sticks of new RAM to my computer, but when I turned it on again I got the two-beep "RAM Not Detected" signal. I removed the new RAM, but I still got the two-beep signal after turning it on. I've removed the old RAM, sprayed the area with duster, put the old RAM back and still have the same problem.

What to do? Thanks.