So at this point I am at my wits end been trying to figure this out for the last year but no luck on finding solution to my laptop reboots as soon as it shuts down... only thing I can do is shut down then once rebooting starts press and hold power button for 30 seconds (manual shutdown)
Here is what I've done and tried: Newer battery (less then 50 cycles)
'New' Motherboard (Compuparts Solutions, says they buy directly from HP as New Boards) -Still have old motherboard with same symptoms (hence why I'm fairly sure its not the motherboard itself but poor design and hardware)
*Tested 3 different power adapters/chargers from 45w to 65w -Reboots after shut down with and without charger
*Passes all diagnostics (but poor system performance graphics, cpu, disk, memory in windows 10 performance reports) -userbenchmarktest everything but GPU (63.1 percentile) and hard drive (77.3 percentile) running in high percentiles (93+) -did windows and an independent memory test program which said memory passed -did comprehensive hard drive test both through windows and independent software which hard drive passed
Fresh install and updated Windows 10
All drivers fresh installed from most updated versions
Bios updated and settings set to default and checked
*Unchecked under advanced start up and recovery restart in event of errors
*Unchecked Fast Reboot in power management settings -changed power setting of power button and lid to shut off -ran troubleshooter for power management and accepted fixes
*Uncheck under intel management engine properties allow to turn off computer
Tried both Intel HD graphics and then Nvidia graphics as main gpu
Restarts after shutdown with Mint Linux as well
....... I guess I'll start pulling what hardware can and seeing if anything changes... but at this point I doubt it and I'm sick of throwing money at this laptop....
Any help or insights appreciated, if anyone has truly figured the issue out please let me know.
So I've unplugged the battery, then Hard drive, then each stick of memory (then tried each slot with each stick), unplugged web cam, unplugged screen and touch display... each time and finally with mostly everything disconnected laptop was still automatically rebooting by itself. At this point it's the power/usb board or some fail safe for no or defective battery or the ddr4 memory which isnt low power(which I really doubt).
Ok finally seems like I've fixed the issue, it was the separate usb/lan/power board... I just replaced and no rebooting after shut down, it appears a previous owner had some liquid spillage and didnt think it gotten into laptop.
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