Notebook HP ze4354EA does not switch on

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Hi there,

my laptop HP ze4354EA does not switch on anymore.
It was perfectly working until two weeks ago, I charged the battery up
to 85% and simply I switched it off.

With the BATTERY IN and the POWER SUPPLY UNPLUGGED, pressing the power
button has no effect: nor noise from the fan, neither LED or LCD

With the POWER SUPPLY PLUGGED IN the 220 Vac and BATTERY IN there is
only 1 LED ON  (power connected) but still
no activities pressing the power button.

With the POWER SUPPLY PLUGGED IN and without the BATTERY IN, the power
LED is flashing but still not able to switch on.

Pressing the RESET button on the bottom doesn't help.

I also checked the SoDIMM, but thery are in the proper position and
does not show any failure.

What I can check more?
Any experience with this kind of trouble?

Tnx 4 any suggestion.

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