Replaced Water Pump, Jeep Doesn't Start

[bangschr]

Ok, hopefully someone has a solution.
I replaced my water pump today on my 2008 Jeep Liberty, but had to remove the alternator to have enough room to get the old pump out. I disconnected the negative terminal during this.
After finishing, I try to start the Jeep...but nothing. I have no power anywhere except for the dome light. I also cannot get the car out of park.
I tried to jump off the car, but that didn't help.
I did notice that if I disconnect both terminals for a few minutes then reconnect...the horn beeps. But then I'm back to the same situation.

Any ideas? Could it be something to do with the key fob? That stopped working about 6 months ago, and didn't cause any problems then.

 

[JeepinJarhead03]

the typical security key behavior would be for the vehicle to start and run for about 10 seconds and then shut off, if its done 3 times itll lock the system down until its reset. but ignoring typical because its not always typical behavior when batteries have been disconnected prior to the behavior

get a fresh battery put in the key fob, then reconnect the battery and lock and unlock the vehicle half a dozen times or so, and then unlock it and attempt to start it

the other chance is, that there's been a short at some point between R&R'ing the alt. - but a pre-existing dead key on a security key vehicle + an unplugged battery may actually be the issue. it's at least the easiest one to attempt to sort out, ~4 bucks

is the security key light active on the dash?