The problem started after I updated Windows this morning to Windows 10 (64 bit) Version 10.0.16299 Build 16299. After installing, I browsed the web for a little bit after, and an hour or so ago started a game of Heroes of the Storm. The game crashed while loading a game. I booted it back up and it played normally for about 3 minutes with ~160 FPS at max settings, after which both of my monitors switched off (sound was still working fine). I smelled something like plastic burning, and the power button on the computer went solid red. I turned it off with the power button and let it sit for a few minutes while I opened up the tower to take a look at things.
The GPU seemed warm, but not unusually hot. I couldn't confirm whether the fans had been working. The fan on the processor seemed to be fine.
I grabbed a spare HDMI cable and plugged the main monitor into the mobo directly, and looked at some help forums while I downloaded the newest AMD software. Running that brought up an Error 173: AMD Graphics Hardware Was Not Found. I tried three different AMD installations (the main driver software suite, the AMD chipsets, and the more bare-bones Catalyst I believe), all of which bailed out after returning that error.
I then checked all the cables and connections to make sure everything was OK on that front. Haven't found any problems but I'll keep troubleshooting it.
I'm suspecting something with the Win10 update messed with the card and now it's overheated and bricked itself. Any inklings of what I can try to get things working again?
I've pulled out the graphics card and reinserted it plus checked the connections to make sure everything's hooked up properly.
When I plug either monitor into the GPU, it changes from "not connected" to "no signal." Not sure if that helps at all.