I read the Williams article before my post. Notice he does not claim the monitor was broken at the time of the accident.

In the NY Times article written 5 months after the Williams article Williams is quoted. He mentions the general alarm being turned off automatic but makes no mention of
the crashing computer.

Paraphrasing from the Times article...

The accident and explosion did not suddenly happen while everyone was asleep.
Many of the crew were at work. Crew were on the bridge which was also the command center for monitoring.
Some VIPs were there too. The drilling crew were preparing to cap the well. Two of the drilling team were discussing puzzling pressure readings.
The disaster started with drilling mud gushing out of the well.
Two crew members noticed this.
It was 9:47 PM, from that point until the first explosion was
nine minutes.
What followed in those nine minutes was like the fog of war. Confusion, indecision, poor communications.
At the push of a button the general alarm could have been sounded but it was not.
Even as more and more gas alarms went off on the bridge it was not sounded.
Only after the first explosion was it sounded.

It's an excellent article. You need to read it and decide for yourself.