Laptop powers itself on and refuses to stay turned off

Hello,

So my Sony Vaio has decided now to never turn off.
Go to the power button and press shutdown, it shuts down and then once it is finished powering off (all lights go out and everything) it powers its self back up.

Remove the battery and wait 5 minutes, replace the battery it powers back on.

Remove the battery and connect the mains lead, powers on.

Checked settings and I cant see anything that would cause this.
It has been running fine until today, unless it installed an update but I dont see how it can just be an update causing it to just turn on as it wants.
Its not a stuck power key otherwise it would also turn itself off.
It is not just going into hibernation mode, I am trying to properly shut it down, which it does but then just comes back.

Any advice would be great, can only find stuff about unexpected shutdowns not the opposite.
Thanks

In Advanced Power options set the Power button to shut off the machine. Then use the power button to boot down. This is to test the button.

Then I would boot to the WinRE disk, then boot down. See if that breaks the reboot cycle.

If not, boot back to WinRE (you can burn this disk from Control Panel / Backups), and run the Command Window. From there type bootrec /rebuildbcd. That might clear any reboot flag if there is one.

Tried it today and it wasnt doing it, going to now run a system restore to a point prior to the updates, if it occurs again I will try these steps.

Thanks for the help