My screen goes black while gaming, but I can still hear the game and voice chat. Other people can't hear me, and I have to restart the PC. It happens at unpredictable times.
Lowering the resolution and graphics settings and using windowed mode haven't helped. The problem also happens on both Windows and Linux Mint. What should I check?
Start with the GPU, but don't assume it's dead. Check its temperatures while a game is running, and try a different supported graphics driver. The fact that it happens on two operating systems makes a single OS-specific issue less convincing, though it doesn't rule out drivers.
Post the full hardware specs too, including the GPU, power supply and whether this is a laptop or desktop. That'll help narrow down what can be tested.
Try another display cable and port, and make sure the resolution and refresh rate are supported by the monitor and cable. A cable or bandwidth issue can cause a lost picture without necessarily meaning the whole computer has crashed.
Power delivery is another possibility, especially if it only happens under gaming load. Check the power supply model and its capacity against the PC's components. A weak or failing supply could cause trouble when the GPU draws more power, but those symptoms alone don't prove it.
If this is a laptop, try connecting an external monitor or TV. If that stays on when the laptop screen goes black, the built-in screen or its cable becomes a stronger suspect.
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ix2~port:
The microphone also stops working, so the display connection may not explain everything. Still a useful and easy thing to rule out.