I have had my mac-book pro for almost a year, and have just got OSX Mavericks, and now the sound on my laptop is working in a sporadic way, can I change this at all on system preferences or will I have to get it repaired?

On my mac-book pro the sound isnt working after I have installed OSX Mavericks, should I take it to be repaired, or can I do something on System Preferences?

In addition to checking system preferences/sound/output and selecting built in if that does not work, make sure volume is up and mute not checked.
You can try the following, Take a set of headphones and plug theim in and out several times (there is a micro switch that sometimes gets stuck)
Go to applications>utilities>Audio MIDI set up, see if you can select built in there, make sure volume is uo mute not checked.
Try a NVRAM/PRAM reset:
Power off, power back on holding the following keys   OPTION + COMMAND + P + R
Continue to hold these keys till you hear the start chime 2 times, then release,reboot

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