Today, I cleaned out the PC, and got a new rear case fan. The old one finally gave up on maintaining torque. The lubricant probably failed from years of tiny dust particles seeping into the ball bearing housing.
In any case, Noctua quality yay! Colors boo.
At the same time, I figured I could use this opportunity to try reseating my dying GPU to see if it would fix the graphics issues (artifacting, black screen, and driver crashes) I've been plagued with prior to switching to GPU life support (AKA no GPU drivers) a few years back. After removing the GPU I noticed, to my horror, that the GPU heatsink was choking with dust. Prior cleaning must have been ineffective at reaching in there. Fan was visually confirmed to still be functional. The card had maaaaybe a tiny bit of sagging, but it was hard to tell.
After cleaning out the GPU and putting it back in, the PC POSTed and started up like usual. Cleaning introduced no failures.
Then I installed the GPU drivers, rebooted, POSTed, Windows startup logo, aaaand no login screen. Just pure backlight black, not even a sound. Both PS/2 keyboard and USB mouse lost power. Gave it a few minutes, but nope.
First hard reboot, keyboard had power but attempts to select safe mode was not registering.
Second hard reboot, keyboard worked normally and safe mode was entered. Everything appeared fine and working, so proceeded to uninstall the drivers.
Back to GPU life support.
*sigh*
Failure hypothesis: Years of dust had clogged the GPU heatsink to the point that a stressed out GPU overheated and the heat damaged (burnt out?) a part of the GPU chip or memory. The overheating may also have been exacerbated by a failing rear case fan. The GPU, for all intents and purposes, is basically dead, but still has enough functionality to function as a video pass-through.
Alternative hypothesis: GPU is fine, but the PCI-e slot is fucked from sagging. (Possible, but unlikely given how little sag was visible. Also not in the mood to set everything up for PC surgery again.)
Alternative hypothesis: GPU and PCI-e slot are fine, but the RAM or motherboard are fucked. (Highly unlikely without constant BSOD)
At least there are a few silver linings. For one, GPU prices are beginning to come down. Just gotta save some cash and wait for a reasonably priced mid or mid-high card. Web browsing, video watching, drawing, writing etc. still works, and I do have a few games that don't require drivers.