I keep getting this blinky green key light? Any ideas.

2003 EX. Almost every morning before heading to work I turn the key and the key light starts to blink the engine turns but won’t fire. Then when I turn the car off and retrieve the key, I get a clicking and the key light begins to blink really fast. I don’t remember how, but I figured out that giving it firm smack above the speedometer while it’s off stops it. Any ideas what it could be?