Turns out the transformer in the light (the box-like component that
sits within the power cord) failed. I had my pond shop take a look at
it today. I don't know when it's going to get repaired and I can
already see that my pond is already losing the clarity after two days.

The lesson I learned from this fiasco is that I should avoid CalPump
products in the future. I still haven't even received a reply to the
email I sent. Does anyone have a recommendations for a good -RELIABLE-
UV clarifier or sterilizer for a 4000 gallon pond because I'm going to
try to get a store credit if possible. Not only do I want to device to
actually turn on, I want some other simple things like the ability to
see whether or not the device is on.

I'm so sick of buying expensive crap that doesn't work. My $3500 Sony
TV set acted the same way: it worked for a little while (thus teasing
me with its potential) then suddenly failed to turn on. Though I did
get more than 8 days out of that TV....