Random reboots can be anything, but often they're a power supply issue, and even more often, a RAM issue.
The first thing I'd do if I were you is to try only 1 RAM module, run it for a few days, see if it's still acting up, and then try the other RAM module to see if you can isolate a bad RAM. Also be aware that while you can normally mix and match different RAM modules, sometimes you cannot. This is *especially* true if they're not the same speed and/or amount of RAM, but also even different manufacturers can give you headaches. Like many things in tech, such issues are not supposed to happen, but in the real world they do. Have fun... -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?