From LedHed's Wiki
Sometimes you need to reboot a server from the command line.
It used to be a simple process, but with 2008 on there are a few extra command line switches that need to be passed.
shutdown /r /c "Rebooting in 60 sec!" /t 60 /d P:0:0
This will shutdown the local server with a 60 sec delay.
To reboot a remote computer add the following switch:
/m \\computername
Note: the /d P:0:0 there are many possible reasons.
Reasons on this computer:
(E = Expected U = Unexpected P = planned, C = customer defined)
Type Major Minor Title
U 0 0 Other (Unplanned)
E 0 0 Other (Unplanned)
E P 0 0 Other (Planned)
U 0 5 Other Failure: System Unresponsive
E 1 1 Hardware: Maintenance (Unplanned)
E P 1 1 Hardware: Maintenance (Planned)
E 1 2 Hardware: Installation (Unplanned)
E P 1 2 Hardware: Installation (Planned)
P 2 3 Operating System: Upgrade (Planned)
E 2 4 Operating System: Reconfiguration (Unplanned)
E P 2 4 Operating System: Reconfiguration (Planned)
P 2 16 Operating System: Service pack (Planned)
2 17 Operating System: Hot fix (Unplanned)
P 2 17 Operating System: Hot fix (Planned)
2 18 Operating System: Security fix (Unplanned)
P 2 18 Operating System: Security fix (Planned)
E 4 1 Application: Maintenance (Unplanned)
E P 4 1 Application: Maintenance (Planned)
E P 4 2 Application: Installation (Planned)
E 4 5 Application: Unresponsive
E 4 6 Application: Unstable
U 5 15 System Failure: Stop error
E 5 19 Security issue
U 5 19 Security issue
E P 5 19 Security issue
E 5 20 Loss of network connectivity (Unplanned)
U 6 11 Power Failure: Cord Unplugged
U 6 12 Power Failure: Environment
P 7 0 Legacy API shutdown