computer reboots after shutdown in windows 10

my computer reboots after shutting down with mouse...I have done the SFC/Scannow and the DISM scan both came up ok....I have changed all power/sleep settings to NEVER and I unchecked FAST START UP...Windows are updated and HP don't have any updates for this computer anymore...any ideas folks

Please open the Command Prompt by typing cmd.exe into Start Menu, right-click on Cmd.exe, and open it as an administrator.

Execute below command to see computer shutdown.

Code:

Shutdown  /s  /t 0

ok I did the Shutdown /s /t 0 and a list came up....what next?

- - - Updated - - -

I did the Cmd prompt and typed: Shutdown /s /t 0 and computer did shutdown but rebooted a couple seconds later...I have done this before...still no change with my issue of computer rebooting after shutdown...

when the PC reboots the computer runs as normal...desktop appears...no messages...

could it be a faulty power button?

Please perform the following steps:

1) Run tuneup.bat > post result into this thread
Batch files for use in BSOD debugging

2) Run the power troubleshooter > post images of the detailed results > test shutdown

Take Screenshot in Windows 10
https://support.microsoft.com/en-gb/...re-screenshots
How to Upload and Post Screenshots and Files at Ten Forums

3) run powercfg -devicequery wake_armed > post results

4) Turn off hibernation > test shutdown
Powercfg -h off

5) Download and install HP UEFI hardware diagnostics: (left side of this webpage)
https://www8.hp.com/us/en/campaigns/.../pc-diags.html

6) Plan to run the HP UEFI hardware diagnostics overnight > extensive > loop until error
(launch by power on and repetitively clicking F2)

7) The next day if it has made 2 or more loops click esc > run any component test (as necessary) (many are interactive)

8) Take pictures of the tests performed with results using a camera or smartphone camera > post images into the thread

9) Run the V2 log collector > upload results directly into this thread:
BSOD - Posting Instructions

I tried running tuneup.bat and it was blocked telling me it might harm my computer...??

That is typically seen when running a bat file.

tried powercfg -devicequery wake_armed... and powercfg -h off just getting screen flash...by the way BIOS says legacy