Before i upgraded my ram i had 256mb sd dimm ram. i have now bought a new 1GB ddr dimm stick of ram.

Both the OLD and new ram are COMPATIBLE with my computer as there is slots for them both. however when i check how much ram i now have the computer only displays 992mb of ram. what has happened to the previous ram i had?

thanks for any help.
The problem could be that even though the MB supports two types of ram, it doesn't support using both at the same time. But could you please specify what MOTHERBOARD and ram you have.Deer park i think that you have hit the nail on the head, the motherdoard will only support 1 type of ram at a time as i have researched this for a friend of mine, i do not know of any mobo that accepts two or even three different types of memory at any one time
all the best
cheers
SimshiYeah I'm also pretty sure that's the problem, I just didn't want to rule out the possibility of a MB that supports using two or more types of ram at the same time.i was told by my comp lecturer that it is phisicaklly impossible to run different types of memory on 1 mobo because the types and speed s are completly different and could not distinguish between the two or even three he said but if he is wrong the sombody please let me know i would love to put him in his place...
cheers
Mattthank you guys. so shall i remove the old ram or shall i leave it in or does it even matter.

thanks again. take out the 256 because obviously you want the larger ramand see howyou get on let us know
Simshi
Yeah the old ram is PROBABLY not hurting anything but I'd take it out to be on the safe side.okay will do thanks again guys Glad I could help no worries dude will help where i can
Simshi