I have a Windows 7 ultimate machine and it keeps shutting down on its own. I dont see anything in event viewer except:
Event ID 41: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.
Event ID 6008:The previous system shutdown at 1:49:18 PM on 12/9/2015 was unexpected.
Can someone assist on what could be causing this or how to start troubleshooting it?
Motherboard failing, power supply failing, overheating (possible also).
You could start by opening up case and inspecting motherboard for swollen or discolored capacitors. If you find those you've probably found your culprit. While open check for dust and blow and vacuum any out of the system. Also check power supply inlets and outlets for dust. Also while open get a big fan to blow into it and try restarting and running it like that. That'll give extra cooling to the system.