Hello fellow techs, I'm a newbie in the field. I've been at it for a couple years. My custom built PC keeps rebooting probably 5 to 10 times a day. I checked the event log and it just says unexpected shutdown and does not say a reason. Is this a bad hard drive, power supply, Cmos battery? Please help, I don't know if I should format first or start replacing hardware. Please give me some advice. Thank YOu