Aura HD Kobo Aura won't start

Good evening,
I am having an issue with my kobo aura hd.
When i try to turn it on using the normal button, nothing happens.
If I plug it to a power source, bot the screen and the led blink a couple of times, but then the device doesn't turn on.
If i press the soft reset button (the tiny hole) while the device is linked to a power source, the double blinking process starts, but it leads to no results. If i press the soft reset button when the device is not linked to a power source, nothing happens.
Last things I did before experiencing this issue were:
-factory reset,
-connected to my PC and initialized using Kobo Desktop,
-disconnected and it was working.
-I then re-connected it to my pc, turned on Kobo Desktop and after uploading one file, I disconnected it without safe unplug.
I really tried every possible combination of soft reset button/power source/power button nut the double blinking process is the only response i can get out of the e-reader.
Any ideas? even the most basic thing is appreciated,
thanks guys!