Question My PC crashes at random, the screen will go black with my monitor saying "hdmi 1" then it reboots.

[smcgr123]

I have an i76700k, GTX 1080 and a 500W PSU along with 16gb ram

 

[NightHawkRMX]

Unexpected restarts are often a power issue

500w is low for an I7 and GTX1080.
What is the make and mode of this 500w psu?

Is this a prebuilt?

 

[smcgr123]

It is a SilverStone SX500, I've had this PC since December 2016 and it is not a prebuild.