[SOLVED] How do I fix when my monitor blackscreens and GPU fans max out but computer programs continue on normally in background?

[BohemYord]

So I recently had an issue with my computer where when I load up a game, specifically New World, my game will black screen on startup of said game. The game continues on, programs continue, Discord calls continue, etc., but my GPU fans go full blast, and the black screen happens. When I hard shut down my computer with the power button and start it back up, my GPU is disabled about 90% of the time in the device manager. This all started when I upgraded my old monitor (1080p /60hzHP office depot monitor) to the Dell S2721DGF 27.0" 2560x1440 165 Hz Monitor. It might be worth mentioning, however, that I upgraded my RAM a week or two before getting the new monitor. The problems only started after using the new monitor, but I just want to give all possible useful information. If I do a full restart of my computer before loading up the game (after extended use of a second monitor or just generally having a computer on for a few hours), I can usually avoid the black screen issue and play the game normally. For context, my in-game resolution in New World is at 1080p and default monitor resolution is at 1440p in Windows settings. If I play a lower-demand game, such as Lost Ark or League of Legends, I can play on 1440p, 144hz, highest settings, and never crash on load up. The black screen happens both when my second monitor is plugged into my desktop and when it is not. My assumption is that my GPU is just getting too old and dying out trying to pump out 1440p/higher than 60hz, but I'm hoping y'all can give me any other insight if there is a bigger issue I am missing. My parts list is included below.



CPU: Intel Core i5-6600K 3.5 GHz Quad-Core Processor
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler
Motherboard: MSI Z170A SLI PLUS ATX LGA1151 Motherboard
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3200 CL16 Memory
Storage: Samsung 850 EVO-Series 250 GB 2.5" Solid State Drive
Storage: Western Digital Caviar Blue 1 TB 3.5" 7200RPM Internal Hard Drive
Video Card: MSI Radeon RX 480 4 GB GAMING X Video Card
Case: NZXT S340 ATX Mid Tower Case
Power Supply: SeaSonic M12II 620 W 80+ Bronze Certified ATX Power Supply
Monitor: Dell S2721DGF 27.0" 2560x1440 165 Hz Monitor

 

[JohnBonhamsGhost]

my game will black screen on startup of said game

the M12II series power supplies are very low quality.
and with a low quality power supply issues like this commonly arise.
while the graphics card is trying to draw more power for more intensive tasks the PSU can fail to deliver and end up with problems like you're facing.

my first move would be to replace it with something you can rely on and not continue to risk damage to connected components in the future.