Sound not working macbook pro

I am unable to controll the speakers on my Macbook Pro 13" Mid 2012. But when i have headphones in my sound is fine.
When i try to controll the volume on my keyboard there's just a "/" over the sound icon
Any help appreciated

Hopefully one of these steps should solve the problem.
System Preference > Sound > Output > Internal Speakers
Make sure Mute is not enabled.
Remove the headphone.
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 times to flip the microswitch inside.
Sound output may be stuck in the digital mode.
Reset PRAM. http://support.apple.com/kb/PH4405
Reset SMC. http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Best.

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