XPS 12-9Q23 not powering up not charging

XPS 12-9Q23 on windows 10 not powering up and not charging battery. I have bout another ac adapter but that has not helped. Is this a motherboard problem? The person from dell support asked me to wriggle the pin at end ,but that did not resolve the problem. Is this a motherboard issue?.  ALso this laptop has had the problem of not shutting down completely where by it wakes itself up. Also at times the fan and keyboard back-light stays on  for a while after shut down.

Why is the quality of these laptops so bad?