Computer keeps crashing sans BSOD

[mbstone]

Windows event viewer says my crashes are "critical" with 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." There has never been an accompanying BSOD message. I checked the RAM and it's fine. Checked the HDD and it's fine too, though it's over 8 years old... I went ahead without too much trouble shooting and bought a new PSU, as my previous one is a cheap EVGA 500W 80 Plus from January 2014. The new PSU is on the way, but in case that's not the issue, anyone have any suggestions?

 

Specs: Full retail system I built (most parts from 2014), Windows 10 Pro x64 installed 2015 (originally Windows 7, did a clean format to Windows 10), Gigabyte GA-B85-HD3, Core i5 4670k, HyperX 8GB RAM, MSI R9 280x, HDD WD Black 1TB (from Feb 2011!) + SDD Samsung 840 Evo 250GB. Anything else you need to know? Thanks in advance.

 

-Mike

 

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