windows 10 hp prodesk core i5 Recovery from sleep mode no video for 20 to 30 minutes

[Windows Server]

windows 10 hp prodesk, core i5, Recovery from sleep mode no video for 20 to 30 minutes.same on cold boot. System seems to be recovered. i.e. plugging in or removing USB device gives an audio beep.Disk activity light is blinking. I can turn audio on and off with keyboard.

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