Please also confirm for me your BIOS chips have matching BIOS versions in them, if not this can sometimes occur as well.
To check, go into the BIOS and on the MAIN page press F9 for system info. You should see both BIOS versions listed, if they do not match please update the backup BIOS to match the current.
To do that, reboot and where you would normally press END to enter the BIOS, instead press Alt + F12, this will flash the Backup BIOS with the MAIN BIOS contents. Do not worry when you see a recovery comment, that is normal and means it is flashing the backup BIOS.
Once finished, go into windows and see if you can then use your reset and shut down buttons.
And yes, you MUST Set the time correctly in the BIOS, then once in windows sync it with windows time. If you notice windows time is far off from what you just set in the BIOS, go back to the BIOS and set as close to windows time as you can, then come back to windows and sync it again. Then it should stay correct unless you have a power or battery issue.