This is NOT a good reason for server downtime!
You might think that your network administrator might know enough to have all systems plugged into KVMs or at least ensure they have a BIOS that can be configured to ignore keyboard errors. It becomes troublesome when the responsibility is shifted to the people at the off-site datacentre, but that may have been the case. Frankly, that's the risk of allowing the employees of the datacentre touch your equipment, they don't have the same level of ownership that your own staff do.
Either way, a friend of mine expressed great frustration when a high-priority server rebooted due to a fault and didn't come back because someone had left it detatched from it's keyboard.