XPS 15 9550 won't boot - power light turns on (white) no beep or light codes, no POST
Was experiencing general issues with my windows profile after windows updates last patch Tuesday so I initiated a system restore and let it run today. After completion laptop turned off (instead of rebooting?)
Pressing the power button: Power button turns white (on) for ~30 seconds, then laptop turns off (indicated by power button light)
no screen (back-light or otherwise)
no POST codes - beep codes or light codes.
no other visible activity
During that period nothing else happens, unless I press the power button again. If I do this
The fans spin up momentarily
The system then powers off (as indicated by the white power light)
Disconnect power/battery and hold power button (60 seconds)
Power system on with just battery
Power system on with just wall power
Remove mSATA HD and repeat the above
Disconnect video connector and repeat above
Remove mPCI WiFi module and repeat above
Completely disassemble and remove CMOS battery (tested at 3.1 VDC) for 60 seconds, reassemble and repeat above
All with no change in behavior
I am able to get a light code 2 Amber / 3 White if I remove the RAM module (as expected)
D + PWR diagnostics cycle successfully through a range of colors then nothing
Laptop is 2 months out of warranty. Any help debugging the issue is appreciated!
XPS 15 9550 September 2016
UEFI Secure Boot was enabled
HD was bitlocker encrypted in Windows 10
HD is currently removed and has not changed behavior
RE: XPS 15 9550 won't boot - power light turns on (white) no beep or light codes, no POST
Thanks for posting.
Apologies that your system is not working as you expected.
Unfortunately from the research I can find, it would appear that the motherboard has failed. You can contact Dell's Out of Warranty department for information on costs of parts and repairs, or you could consult with a local computer repair shop.