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It has nothing to do with an output device. As soon as you plug an hdmi or dp cable into it, it starts flashing no signal. There isn't any device on the other end.

No other colors.

Resetting...

Vp32uq monitor. When the monitor is turned on with any hdmi or displayport cable plugged into it, it repeatedly flashes the bright blue no signal screen every 10 seconds. It should flash no signal...