I posted a little earlier about my computer, a7v133-c with 1.3g and 512 ram. I guess I should given a little more information. I am trying to use three 256 micron 133 chips, all identical, manufacturer and all. Two will work, but with three I get a stop screen. I have seen all of the xp fixes and excuses and tried quite a lot of things. I'm beginning to think maybe it's a voltage issue. If anyone has any experience with the same problem, I would appreciate help. Thanks.

sounds too me like it might be a faulty stick, or not seating properly, the easiest way to check is too mark them wih a tiny blob of tippex and use each one adding till it stops when it does use the last one first then you can check if it is faulty or not, th other thing i have had in the past is as you say a voltage issu is your power unit up to the job you should really be using a min of 300 watts from a decent company and finally try the suggestion above but this time changing the slot you put the memory stick into, it might be the actual board that has a fault also update your bios to the latest version and obviously check that the bios settings are going to allow you to use that much memory some older boards might not hope it helps