PowerBook Spontaneously Reboots?

[wrldwzrd89]

My mother has a PowerBook. I've noticed that, especially when she isn't around, it reboots itself sometimes. I know it's running nothing earlier than 10.3.6...but I need to check the OS version and update status. Anyone know what's going on?

EDIT: Ooops...wrong forum. This belongs in the Hardware Discussion and Help forum. Could some kind moderator please move it there?