Siren Keeps turning on and off after installing new power supply

 I got everything installed and up and running for about 2 days. I was using the DC output on the old DSC board for powering Konnected.  Seems it was not enough and the DC died. I installed a 12V DC power suppy. Everything powers up fine but now the siren keeps turning on and off in about 15 second intervals.  The Red led follows the same pattern. I have rebooted, reset checked dc voltage 12.7 Volts. Removed wires and it keeps doing this.  Anyone have any ideas what's going  on?  Thanks ahead of time