2007 Dodge Nitro security alarm system indicator light

My vehicle wont start because the system is engaged. I changed the battery in the key because it had not been working since January so I assumed it was the battery but nothing happened. I then disconnected the battery in hopes of the computer system shutting down and hopefully reboot itself but to no avail still no start. I was trying to avoid paying tow fees to the dealer and or purchase another $253.00 key.

Thank you in advance for your help,

Tanya Peace