why is my pc saying no signal

[Windows 11]

i was playing resident evil 4 on my ibuypower pc on windows11, i went to save my game and my screen went black and started making a buzzing noise. I turned my pc and monitor off and back on and its just saying no signal. I checked all my wires, although I haven’t changed anything and they’re all in the right spots. I got my pc maybe a week ago too, it’s not old at all. I even plugged my Xbox into my monitor and it works, so I don’t think it’s my monitor. im just really confused and don’t know what to do anymore. i was playing maybe 30-60 minutes and it wasn’t overheating.

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