Speakers not working, but headphones are

1.System Preference > Sound > Output > Internal Speakers

Make sure Mute is not enabled.

2. 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.

Go to systempreferences and under the output tab make sure built in speakers is selected.

You can also go to utilities audio/MIDI set up, under output tab, source built in speakers.

Also, NEVER stick a paper clip or anything else that can conduct into the jack, if you had a red light you can use a wooden toothpick, or a Q tip with end cut off

Hope this helps.

A few things you can do....

Repair permissions & restart.

http://docs.info.apple.com/article.html?artnum=300832 Mac OS X: No audio from certain multimedia content

Open up GarageBand if installed then, open a program (optional). Quit out of the GarageBand app.

Try a pram reset:

Power off the mac, power it back up holding the following keys immediatly till the start chime rings 2 times.Option, command, P, R (no commas)

Hope this helps

Sorry about that. Apple has been moving furniture around in Knowledge Base again.

Troubleshooting issues with no audio from built-in speakers on Macs