Had a few updates to apply including 10.7.5 update for server.
Update failed "cannot recall error"
Reboot was the only option. Now Grey screen with Apple logo and spinning grey cog.
I did a recovery boot.
Select Startup Volume server thinks its 10.7.5 even though the update failed.
Still Grey screen booting
If you have access to another mac try putting the server in target disk mode
Check the drive with disk utility
And try the combo 10.7.5 server update.point it at your server
Retrieving data ...