What happened to my Power Steering?

[msg]

About a year ago I had a garage convert my 66 manual steering into power steering and everythings been fine except today. For the past few days I have had the truck in the garage on ramps working on a dent in the quarter panel. I backed it our today down the drive and when I went to turn there was a noticable screeching sound that sounded like a slipping belt.
It was damn near impossible to turn the steering wheel to park it in a tight spot we have on the drive.

When I looked under the hood this is what I saw










Any ideas on what might have caused this?

I was going to take it to the garage but wanted to know what in the heck could have happened to cause the pulley on the PS box to bend like that.