Alarm Light Wont Stop Flashing And Car Wont Start

[GsJoe300]

Can someone please help me! I got my ignition coil changed on my 2004 gs300 on saturday because my car was having misfires. After changing the ignition coils I tried to crank the car but it wouldn't start, we disconnected everything new and put all the old ones back on and still nothing, then I realized the alarm indicator is blinking even when the key I in the ignition and turned. I tried a locksmith and he assured me nothing is wrong with the key, PLEASE HELP ME. I've changed the fuel pump, spark plugs and also tried everything I read online about resetting the alarm and nothing works, I can activate and deactivate the alarm from my key pad but the light continues to blink and the car refuses to start