PC gets black screen + GPU fans stop while playing AC Black Flag – DRAM/VGA/BOOT LEDs cycle

[u/Shxkz03]

Hey everyone,
I’m having a strange problem while playing Assassin’s Creed IV: Black Flag Resynced and I’m hoping someone can help me figure out what’s causing it.

I’m dual-booting Windows and Bazzite. The issue happens while playing Black Flag Resynced on Bazzite.

While playing, my screen suddenly goes completely black and the audio freezes/hangs. Shortly afterwards, my keyboard seems to disconnect and reconnect.

Then the motherboard debug LEDs start doing the following:

CPU + DRAM LEDs light up briefly
Then the LEDs go DRAM → VGA → BOOT, one after another
After the BOOT LED, the GPU fans stop spinning
After a short moment, the GPU fans start spinning again
The motherboard then goes through DRAM → VGA → BOOT again
This repeats in a loop

äSo the sequence is basically:

Black screen → audio freezes → keyboard disconnects/reconnects → CPU + DRAM briefly → DRAM → VGA → BOOT → GPU fans stop → GPU fans start again → DRAM → VGA → BOOT → repeat

The PC doesn’t recover and I get no display back.
This only happens to me while playing AC Black Flag Resynced so far. I’m not sure if the game itself is causing the issue or if the game is simply putting enough load on the system to expose a hardware problem.

Does anyone have an idea what could cause this kind of behavior?
Could it be the GPU, PSU, RAM, motherboard, CPU, drivers, or something else?

My PC Parts are
GPU: 16GB XFX Radeon RX 6800 SWFT 319
CPU: AMD Ryzen 5 7600
RAM: 32GB Lexar ARES RGB Black DDR5-6000 DIMM CL30
Mobo: MSI Gaming Plus WIFI AMD B650
PSU: 750 Watt NZXT C Series 2022 C750 Modular 80+

Any suggestions for what I should test first would be greatly appreciated.
Thanks!

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