Id reseat the memory, and get a can of compressed air and blow the dust out of the system while your at it - Heat buildup can cause a lot of issues, Including expansion and contraction that can wiggle things like memory out of place.
Here is a hint - If you have a canister vacuum or any vac with a hose, hold the hose nearby with one hand while blasting the compressed air with the other - otherwise the dust you'll kick up will settle on everything in the room.