My macbook pro turns on and shuts off after about thirty seconds

After force shutting my computer by holding the on button, my macbook pro will not start up anymore. It displays the loading screen for around thirty to forty seconds, but shuts off immediately after that. My battery is in good condition and works fine.
Does anyone know how to fix this?

Hi ltksm,
If you are having issues with your MacBook Pro shutting down unexpectedly, you may want to try resetting the SMC (System Management Controller). You may find the following article helpful:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Regards,
- Brenden

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