Originally Posted by
Superpilot
Am I missing something here. The (probably TCS) contractor shutdown a power supply and no one knew how to switch it on again?
I think you'll find that switching it back on was what caused most of the damage. From the Guardian website:
In an internal email to staff, Bill Francis, the head of IT for BA’s parent company, IAG, said an uninterruptible power supply to a core data centre at Heathrow was over-ridden.
He said: “This resulted in the total immediate loss of power to the facility, bypassing the backup generators and batteries … After a few minutes of this shutdown of power, it was turned back on in an unplanned and uncontrolled fashion, which created physical damage to the system, and significantly exacerbated the problem.”