just when I thought this whole mystery was nearing an unfortunate inconclusive end, something kinda weird happened this morning. When I went to start up my comp regularly with the 1x 1gb g.skill stick installed, like I have done for the past few days, it wouldn't pass the bios screen and just kept restarting just like it did when I tried to put 2x the 1gb sticks in. For some reason now my comp is giving me trouble with just the one stick, even though I know it's worked. The only way im on a working comp now is because I put my 2x 512s in and they worked. Don't know if that changes anything, but hopefully it pushes the troubleshooting towards a more specific problem?