No Crank

I turned off the A/C when I tried starting, pulled the key and when I put the key back in to try again the A/C and previous settings were on again. Also when I went back out to try again, when I opened the door the Don't Forget Your Key warning came up on the dashboard though the key was not in the ignition.
I had the ECU replaced about 6 months ago.
Any ideas?


