I just bumped my Dell 5150 laptop from 512m (2x256) to 1gig (1x). ANd three separate times I got spontaneous lockups (no keyboard or mouse, hard power down required). I've put back the 2x256 for now. What are the odds it's a linux config thing? Im gonna add mem=1024m to lilo but I dont have faith that's it. Should I assume it's just a bad dimm? Duane