Laptop Alarm lockout

I have Laptop Alarm by syfer.nl loaded on my laptop. When the alarm went off without obvious reason (possible power fluctuation?), the laptop would not respond - I could not get back to the password entry screen to neutralise.

My only option as I was disturbing others in the office was to power off by pressing & holding the power key.

Now I can't turn the machine back on - obviously for security reasons.

Has anyone else experienced this problem?
How was it overcome?
Or do I have to wait for the good folk at Syfer to read my email, check my bona fides, and then give me a clue?

Would appreciate any advice as I'm headed for a quiet weekend and a lot of thumb twiddling.