Unplug the system, remove the base cover and disconnect the battery. Hold the power button for 30 sec.

Verify that the AC adapter LED is ON.  If it's not, replace the adapter.

Plug in the adapter but leave the battery disconnected.  If the system will power up, but won't with the battery installed, the battery is bad.

If it still won't power up, the mainboard is bad.  Depending on the CPU you have, a replacement board will run between $350 (i3/integrated video) and $600 (i7 and nVidia video) - plus labor to install.  You may be better off seeing if Dell will allow a warranty extension - it will likely still run you $300-400 for a year, but will cost less than a single mainboard replacement.

Thanks, I was having the same issues and nothing worked.  I saw your post, disconnected every connector, removed the lan card, ssd, and held the power button down.  After reconnecting everthing and pressing the power button, the keyboard flashed, monitor lit up and a BIOS error came up for "invalid date and time".  Reset date and time, and it's up and running.

Thanks again.

you're a champ!

This happened to me too.... this is the 2nd time  I had to unscrew and unplug everything and reset the time... is this a known issue ? I actually go a week or so without using my laptop and the battery is dead ( but I always shut down before ) is this what is causing the issue ???

This is a CPU or mainboard failure - the mainboard/CPU needs replacement;  call Dell for warranty service.

Anyone with this issue should try unplugging the coin cell battery and then reattaching it.

I have a Dell XPS 13, I turn on the power the power button lights up white, then on for a few minutes, then turns off and back on. I have taken out the battery, discharged and put back in still does it. I have tried f2,f8, f12 nothing. anyone help? thanks