HP ProBook s 4540 - system does not boot after recovery

My friend gave me the laptop, because the system has not been detected. I decided to recovery operating system.
I had to face following error messages:

-I did not receive "Boot Device not Found" error

I started the HARD drive with result success test

-next step was to recovery OS
He finished with the new error message
"The boot image selected is not authenticated to. "Press to continue.
According to this topic:
http://h30434.www3.HP.com/T5/notebook-operating-systems-and-software/selected-boot-image-did-not-aut...
I did following:
-secureboot changed to disabled
problem persisted

-legacy changed to enabled
Since then, I'm not able to do anything. When I leave the start system, it ends with the HP logo, and nothing happens.
When I press ESC after a reboot, menu appears, but I am not able to enter the BIOS. If freezes all the time in the menu with the text highlihted.

I tried to remove the battery, unplug the power, press the powerbutton for 30 seconds, nothing has changed.

Next step should probably be to temporarily remove the RTC battery, but I don't know if I'm allowed to open it without losing the warranty.

The laptop is about 3 months old.

Hello:

Because the laptop is under warranty, I suggest your friend contact HP technical support and ask them to solve the problem.

When you get a not found boot device error it's hard drive (if the test says it is spent or not) or the drive controller on the motherboard.

I wouldn't touch with a ten foot pole.

HP support will probably have your friend go through certain stages that you did before they tell him what to do next as return them for warranty repairs, etc.

Tags: Notebooks

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