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Dell XPS 13 9350 LED blinking 1 white, 2 amber.

My Dell XPS 13 laptop will not turn on. Earlier today, I turned it on just to check the battery percentage ( it was 48% ) then immediately shutting it down again. Couple of hours later, I decided to turn it on. I waited around 3 minutes on the black screen, and I noticed the LED indicators blinking 2x Amber and 1x White. I tried charging it, it turned steady white for a few seconds then back repeatedly blinking. Most people on the internet said that we should plug out the charger and hold the power button for 15 secs and plug it back in. No, it doesnt work. I've had this laptop for roughly a year now, unfortunately my warranty is over.

2 questions
1. What caused this LED blinking error?
2. How to fix it? If it means that i should get a new motherboard or other components, is it still worth repairing?

Didn't expect this from such a high-end device. =(
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