head-unit secuity feature

Hey, I have a Pioneer DEH-P8400MP ( http://www.pioneerelectronics.com/pna/product/detail/0,,2076_4039_37907,00.html) head unit. I was installing new speakers, and an amp. So obviously I disconnect the negative, forgetting the deck had the security feature, and when I finished installing the equipment, and had it all plugged in, i started up the car, and the unit wouldnt turn on. So i double checked and made sure no fused or anything blew. But i was 99% sure it was the Anti-Theft security kicking in. My question. How do i Reset it? i dont have a manual, and i read the one on the pioneer website for my head unit. This has happened last year, before i bought the car off the person when i was testing it. but it was working this time.

A little more info:

When I first tested the car last summer, we put my batter in the car, because it didnt have one. The head-unit wasnt working at the time, but i didnt end up buying the car. When i bought it this year, i picked up a new Eliminator deep cycle battery, and put it in. everything worked fine. Then when i didnt this install, it didnt work after. can anyone help? thanks.

Try http://www.pioneerelectronics.com/pna/faq/list/0,,2076_149599157,00.html

Go to Knowledge Base at the bottom of the page...type in "security" in the box, scroll the categories to "car audio" and "CD player".