I was wondering if any one could help me out with a computer problem I've been having. My computer for some reason when Im tring to run a part program; it will stop and reboot it self. It nevers happens in the same spot. Sometimes it will run the program all the way through. Then sometimes it will stop after only a few lines. It happens on various different part programs. I just purchased a new/used computer to fit in a enclosure I purchased. My old computer was a tower model and I needed a lay-down one to fit inside the enclosure. I purchased a computer from a guy that sells used computers and computer parts, that lives just up the street from me. The computer is a Deskpro 1000 mhz celeron processor, Right now it has 512mb of Ram. It only has DOS and the CNC control software installed on the hard drive. My old computer was running the same software and never rebooted, running the same part programs. I have tried every thing I know to try to figure it out. I totally unhooked the CNC and it still happens. I even took the computer from the shop at my parents house and brought it to my house, it still does it so I don't think it is a power problem. I also took the first one i got from him back and he gave me another one ( identical) and it still reboots. I tried about six different sticks of RAM with varying sizes and it still does it. I have tried 3 diffent hard drives ranging in size from 2GB to 8GB still no luck. I also changed the 100watt power supply that came standard in it to a 300watt power supply, still didn't fix it. I have also tried about 4 diffenent keyboards. I have tried adding fans and leaving the case door off to make sure it wasn't over heating and it still crashes. I have also tried 3 diffent video cards. I tried using a older version of the CNC control software I am using, it seemed to help some but it still reboots. I am starting to wondering if it is a compatablity issue between the software and the computer athough I have herd that is very rare with DOS based programs. I have also tried 3 different monitors and different power cords with no luck. I have exausted my brain tring to figure it out. But like I said before ,my old computer (which is a Compaq Presario AMD around 500 mhz I beleive) has no trouble running the same programs. I have the software pretty much set up identical(my old computer and new one). I was wondering if anyone has any ideals, maybe Im just over looking the abvious. I have tried various other things also, im having trouble remembering all the things I have tried. But I will post any that I remember. If any have any suggestions please let me know. Thanks- Robbie