Bad battery?

I got into my vehicle and heard a relay clicking before I even put my key into the ignition. Put the key in and entire dash was not working. Head lights still worked, power seats still worked and locks still worked. Car did not even try to start, no interior lights no radio. Not even mileage will come up, or starter even engage. The relay that was clicking when I got in was the turn signal relay. Also found blower motor fan would be running with the key in the off position. As soon as I turn the key in the on position blower motor would stop. Also found the security lights would blink rapidly for one minute then it would blink no specific pattern but very slowly. Yes, I checked the battery, alternator and changed the relay. If anyone could help I would greatly appreciate it.