Spontaneously rebooting

Sep 3, 2001
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Last week or so my system, which has been totally stable up until this point, has started to spontaneously reboot itself about once a day or so. I kind of have my ideas as to what could be dying and causing this, but I wanted to get some other opinions hopefully to narrow my choices as far as what to swap out first.

System specs:
-Abit BH6 rev1.1 motherboard
-~2 1/2 - 3 year old case w/250watt power supply
-Celeron 522@850 1.7v core voltage, been running stable at 850 for well over a year
-256MB RAM (128MB Viking pc100 cas3 rated, 128MB Corsair pc133 cas3 ... both have been running happily at 100Mhz with cas setting of 2-2-2 for close to 2 years now)
-10GB Maxtor 5200rpm on primary master (this drive is as old as box and one of the only original parts)
-10GB Western Digital 7200rpm on primary slave (only about a year and a half old)
-Creative Anhillator Pro (GeForce DDR ... one of the first to hit the shelves when the first DDR Geforce cards were released)
-SoundBlaster Live! Value

That about covers it other than the lan cards and CDROM/CDRW.

Its an old system for the most part, and getting pretty dated. Until very recently though it has been rock solid. My longest uptime in Linux was 36 days, when i rebooted cause I needed to do something in Windows. I'm thinking either video card, power supply, RAM, or even the motherboard itself, but not sure where to start looking. Anyone have any suggestions?