MacBook Pro Mid 2009 does not boot without resetting system management control (SMC) Today i started my macbook pro and after some seconds it stopped working (just turned). I was not able to start it again. After some apple support search I found a page that described how to reset the SMC. After that the notebook startet. Then I switched it of again and tried to start it again but it did not start. 

Now every start requires to reset the SMC. Then the notebook boots up.

Any idea what can cause this behavior?
I'd try to boot the Mac into Recovery Mode and then Reinstall MacOS and see if that helps with the issue. If not then the hard drive needs to be taken in for repairs. You can also try inserting a new hard drive with MacOS on it and see if it boots.