Computer stopped booting. Components have power, but no display at all.

Hello /r/techsupport

I have an older desktop that has stopped booting on me overnight. Here are the specs:

* Ryzen 5 1600X * MSI Radeon RX 580 8GB * 32GB DDR4 RAM * MSI B350 Gaming Pro Mobo * 1TB M.2 SSD (with an archlinux install); LUKS encrypted, GRUB as a bootloader * 256 GB SATA SSD (with a Windows 10 install) * 500 GB HDD (legacy drive from past builds that doesn't see much use)

**Potentially useless background**

The night before the computer stopped booting, I was attempting to play Necromunda: Hired Gun for the first time on the arch partition using the proton compatibility layer. This caused one total crash, which required a hard reboot to recover from and several other crashes that caused the system to hang on TTY1. In order to solve the system hangs I had to enter another TTY and kill all the processes for my user account. The crashes would consist of my entire screen becoming unresponsive while showing a wrongly coloured version of whatever was on my display before the crash.

I gave up on Necromunda and continued using the machine for awhile before going to bed and powering off. The next morning, I could not boot anymore.

**When I attempt to boot I get the following symptoms:**

* All components seem to be receiving power. Case fans and GPU fans spin * Monitor displays a message saying that it does not have any input on the DVI cable that I use for it * Computer does not reach motherboard splash screen and I cannot access BIOS or get anything at all to display on the monitor * The EZ Debug LED on the motherboard indicates 'BOOT' which according to the manual/searching online means that there is either no boot media present or there is some error in reading it

**What I have done so far:**

* I have stripped the machine of peripherals, other than keyboard and mouse and attempted to boot with no success * I stripped the machine down to bare bones, tried both RAM sticks independently and then also tried some spare 8GB sticks as well with no change * I have tried using an HDMI cable for the monitor, with no change * I have attempted to boot the machine with only the arch drive connected and with only the windows drive connected; again with no change * Tried to boot into an archlinux live USB as a recovery option, but without any success * I have removed the CMOS battery, unplugged and discharged the computer before leaving it overnight to allow for the BIOS to reset. Now, the LED for BOOT is not longer illuminated. So it seems that the machine is POSTing, but there is still no display.

At this point, I believe that I have a dead GPU, but I wanted to check with some folks on the internet before I jumped to any conclusions. Does this seem correct to all you lovely people? I have yet to try to use any other displays, but will be able to test that soon.

Any ideas of what I can attempt from here would be greatly appreciated.