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power button blinks 3 times - no display

HP Recommended
Microsoft Windows 10 (64-bit)

this is an all-in-one computer.

working fine one day, the next, hit the power button (it has a led in it) 

hit the power button --  the led in the power button blinks 3 times - then nothing.

the fan starts inside then slows

there is no sound to indicate the hard drive is spinning up

the little leds that indicate activity (two of them) show no indication of life

have tried the hard reset (no power connected - then hold the power button for more than 10 secs.

nothing on display and the all-in one does not have a connection for an external monitor.

hoping for some direction.

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HP Recommended


First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

AND/OR - Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).

This is a possibility...

LED blinks 3 times


RAM Module failure.

1 Reseat the memory. NB:- See the Services Media Library for steps for your PC.

2 Check each individual memory module and swap slots.

3 Replace the memory modules causing three blinks or if the blinks follow the slots.

4 Replace the Main-Board.



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