Video screen does not always come on at bootup. No video at boot. Computer is running. Sometimes video comes on at boot and flickers. It may boot and work or flicker off.
Can not walk away because screen saver greys out screen and it will not light up again.
How old is this All-In-One system? Is the original HP Warranty still active?
Can you use the "Power" settings to disable the power-down of the monitor (after 15 minutes), or to NOT allow a screen-saver?
Clicking the mouse, or pressing the SPACE BAR should "wake" a sleeping monitor.
Your computer has an HDMI-input port, i.e,. connect a game-box, or connect the HDMI-ouput from your cable-TV box, to see if the monitor works fine when NOT controlled by the computer.
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