Until recently, my XPS 15 9530 purchased Aug 2015 has always started up from shutdown or sleep/hibernation with a single press of the power button. Lately however, startup requires a long duration >15 sec press and hold, usually followed by another press before the white LED illuminates. Once it starts, boot-up and OS all come up with no issues. Ran a full Dell pre-OS diagnostics and passed. Upgraded BIOS from A09 to A12. Power-up issue persists. Based on Community comments, I was planning to remove cover to measure CMOS back-up battery as a next step. Any ideas?
UPDATE: This issue occurs when the computer is left in shutdown or hibernate/sleep for extended period (like overnight). If I shut it down and immediately restart, the single button push works.
UPDATE: Computer time and date info is rock solid, which other posters are saying points to failing CMOS back-up. This issue seemed to be occurring for the better part of last week, but does not seem to be a hard failure -- this morning I did a cold start after shutdown for ~ 8hrs and it worked on the first press :-S.
Welcome to the Dell Community @middlejim
Resetting the CMOS would be the first step.
XPS 15 9530 Owner's Manual:
Thanks for the quick response! Not sure what you are suggesting by "resetting the CMOS"? Do you mean replace the coin battery? I figured measuring first before replacing as I believe I will need to re-flash with the current (A12) BIOS?
ALSO: What is the expected lifespan of the coin cell battery? My computer is 4 years and 4 months old.