Leave Memtest for now!! Lets see what dumps get thrown up in the next day. And a huge Thanks for your perseverance in trying to rid your machine of the Gremlins. Nice to meet someone who doesn't give up at the first hurdle. You realise you kept me up all night ya bugger! Waiting to see how things were going! And to think I do this for fun. What a sad life I lead. But strangely, very rewarding. I've forgot, have you posted CPU-z screenshots? Download and run CPU-Z. Take screenshots**/snips of the Mainboard tab, Memory tab and all the slot #'s under the SPD tab. Go to Post Reply, click on the Go Advanced button and attach the screenshots**/snips to your post for all the RAM experts to see by using the paper clip you will find on the top toolbar. Do not zip them up. **If screenshots, please crop. Please make sure you cover every slot number under the spd tab.