Question GPU dead?

[mdlc]

Long time lurker, first time poster!

Mid-game everything went black, my computer restarted, and both monitors showed 'no signal'. I tried the following: re-seating HDMI/DP cables, dusted, removed/re-seated GPU, swapped out power cables from PSU→GPU. The result: nothing, the fans don't even spin. The computer does start up and there are no other symptoms when using onboard graphics.

Does anyone have any troubleshooting tips that I'm missing? I thought it would give me more of a warning before popping like an old light bulb, but maybe not. Is my GPU really dead?

 

[rgd1101]

full system spec? include brand and model of the psu

 

[mdlc]

full system spec? include brand and model of the psu

Built in Feb '16:

i5-6600k OC'd to 4.4
Sapphire Radeon Nitro R9 390X 8GB GDDR - DEAD?
Crucial 16GB (2 x 8GB) DDR4-2133 Memory
EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply
3 ssd - 1 TB/1TB/250GB - these are the only things added/changed since 2016
4TB HDD
msi z170a mobo
1440p 144hz (1440p 60hz secondary)

 

[rgd1101]

yeah, I would think is the gpu.
the way to troubleshoot is get another gpu for testing

 

[mdlc]

yeah, I would think is the gpu.
the way to troubleshoot is get another gpu for testing

Thanks for the feedback, that's what I figured. Since everything is old am I in new build territory or do I put something like a 3060 in this current rig?