XPS15 9550 will not turn on. Blinking lights on battery status light

Hi all,

I got my new XPS 15 9550 2 days ago. Everything went fine at first but tonight when coming back home the laptop won't turn on. I tried the following (both with AC adaptor plugged in or not)

If I press power button the battery status lights blinks 4 times white and é times orange repeatedly.

I tried pressing power button for one minute - nothing.

Pressing Fn key and power button - then the keyboard lights turn on  for about 5 seconds then turn off, and same blinking of the battery status lights as described above.

Any idea what to do ? Dell technical support doesn't seem to work on week end...

Thanks