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Laptop won't boot

HP Recommended
HP Elitebook 8770W
Microsoft Windows 10 (64-bit)

A few weeks ago i wanted to use my laptop but as it started up it was alerting me that the battery was low. Before i could plug the charger in it was already to late and it went off. After that it wouldnt start anymore. 

When the powerbutton is pressed, the charger/battery LED blinks 8 times in "Amber" when the charger is connected and in white when its not. No other signs are remarkable for me. 

I already found someone with a very similar problem on this platform but sadly he didnt response if he already found a solution. Whats different with my laptop is that the LED's on the keyborad remain dark and no fans give a breeze.

 https://h30434.www3.hp.com/t5/Notebook-Boot-and-Lockup/Laptop-won-t-boot-up/m-p/7373041

My troubleshooting yet:

I tried several methods such as dis- and reconnecting the intern keyboard, RAM and CMOS. I dont know if the hardreset used anything or if i did it wrong but that didnt work as well (in every manual is a different method written). I  measured voltage at the battery and the AC-Adapter and its all ok. Nonetheless i tried a different charger and that didnt solve the problem.

Thanks in advance.

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