Possible RS-750LCD problem?

I have a 2003 Hyundai Tiburon with an Autopage RS-750LCD installed.  The other day I took the kids to the park and when we were ready to leave I went to the car and tried to disarm but nothing happened.  I opened the door and no alarm went off.  I was angry but just wanted to get home.  I tried to start the car, but nothing.  I had the battery checked and it was good.  Nothing happens with the alarm.  When in accessory and start the clock,stereo, a/c, windows, etc. don't come on and nothing happens with the starter motor so my car is now a brick.  The only guess I have is that about 3 weeks ago I recieved a new remote and since I did not have the LED installed to save my dash from a hole I had to take it to the local authorized dealer/installer.  He figured out that the valet button was inop and said he put in another one...to this day I can't find it.  He got the remote programmed and I was off.  A couple miles away the whole alarm system fell from up in the dash and was hanging down by my feet.  I did not and do not want to go back to that guy, his shop is the only one in the san antonio area so I am out of luck with finding a competant installer.  In the past 3 weeks several wierd things have happened.  My remote, out of nowhere beeps as if the alarm has armed, but I armed it hours before.  Please any help would be appreciated. 

Oh yeah, no fuses are blown either.

Someone programmed the remote out of range check which is what the beep is.. It sounds this alarm is a mish mash install. This needs to be looked at in person. I don't know what else to advice over the net..sorry.

Ok I decided to take the alarm out just to make sure it was the alarm that killed my car.  I returned all of the ignition wiring back to normal (I think) and took out the starter kill relay.  I still have the same problem.  No power on acc or start.  I used my voltmeter to check on the hot wires (constant 12v) and found 0.  The battery is good because the headlights and dome light works, just no acc/heat or start power....Help!!!