Question PC suddently suddenly losing signal.

Hello guys before one day i moved my computer to another case and added some custom extension cables and a vertical gpu mount.Now my pc randomly losing signal from the monitor and my headset have a beeping noise. Moreover , i think the gpu fans go to 100% speed. I have to shut down the pc from the power button.Any idea?
cpu: ryzen 5 1600
gpu: rtx 2080 8gb
mobo: gigabyte ax370 gaming k5
psu: EVGA 650w GQ gold
ram: gskill ripjaws 3200mhz
 
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When do you hear the beeping noise? At boot up or later?

Is there a pattern to the beeps: longs, shorts, repeating count patterns. Check motherboard's User Guide/Manual for a matching error condition.

Power down, unplug, and open the case.

Start by double checking all cables and connections; especially gpu related.

Hopefully something is just loose.