I broke my shower!

I don't know what I did, or how I did it, but I broke my shower. This place was billed as having a "power shower." Not sure what that means, but I arrived to find that the shower was a separate apparatus from the tub faucet. It has it's own temperature control knob, high/low buttons, and on/off control. I took a shower yesterday and washed my hair, which is typically a long, water-runs-cold process. The water here didn't run cold- it ran out! The thing just turned off! Mid-wash! Thankfully the hair was clean and the conditioner was out already, but my body was still soapy! I thought to myself- maybe this happens when I use up all of the hot water. This morning I discovered that no, this was no mere hot water shortage!
It wouldn't turn on no matter what I did.
I turned the temperature control knob...
Nothing.
I switched from high to low and back again...
Nada.
I turned it on and off several times...
No use.
I currently await the arrival of the landlord/maintenance worker...
I did have a lovely bath though!