Not so much a problem at the moment, just something weird. I have a 1gb kit of RAM in 2x 512meg sticks. One of them stopped working a couple of days ago, I thought I should swap which slots they are in, just in case it wasn't the stick that was dead, but the slot. After swapping them they're both working fine... It didn't look like it wasn't in properly, the clips were still holding it in place, I have no idea what I did.