Check the cpu fan/heat sink for dirt - quite a common cause of reboots,
particularly with K6 chips in my experiance.  Also make sure the box is
well ventilated - one of my machines reboots if the room temperature
goes over 28 degrees centigrade and the second case fan is not on - the
powersupply fan is not up to the job and the box internals get quite
hot.

BillK

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