Dead Alienware Aurora R7

My gaming PC is dead. I purchased the system directly from Dell back on 11/8/2017 so the computer lasted four years. At the time, I had some spare parts leftover from another dead PC, so I purchased a bare-boned system from Dell. I then added more memory, a second SSD, a large internal HDD, and replaced the graphics card with my older Nvidia GT970. There were son initial issues with power management, but the system has worked well for the past four years. Today, there was a notification to reboot the computer to complete some random software update. After the install, my PC turned off and just sat there. I tried turning it on several times since, but the PC just sits there like a large brick.

After much googling, and the fact that the self-test on the power supply unit (PSU) is negative, I purchased a replacement from Amazon. It was a 650W EVGA PSU that was highly recommended by many sources. The current dead PSU is only rates at 460W. The unit cost $90 and will arrive tomorrow.

I really hope this works. It will already be a huge pain-in-the-ass to swap out the PSU. There appears to be a myriad of connectors to remove and reconnect.