Hi there and welcome
Just want to make sure, have you restarted the Mac since having the problem?
Please let me know
Let me know if you then get sound please
Hello there! Please follow the steps below
1. Shut down the computer.2. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.4. Release all the keys and the power button at the same time.5. Press the power button to turn on the computer.6. Press and hold the Command-Option-P-R keys before the gray screen appears.7. Hold the keys down until the computer restarts.8. Release the keys.
Were you able to use the steps from befoer? If so your mac should of kept resetting as long as you held the keys.
Does the mac stay off ? while your holding the keys or do you see the gray screen?
To clarify, you did not get the chime?
If not, can you do these steps please
Power off the mac
Then start the Mac and hold down the Command and R keys at startup.
Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window
choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Startup Disk (usually named "Macintosh HD").
Click Repair. Disk Utility checks and repairs the disk.
Let this complete and when it has, tell me if you still have the problem please.
Plug in headphones, then unplug them, tell me if you then get sound please.
When you put the headphones in, can you get any sound via the headphones?
ok the switch can be stuck in the Headphone mode via the switch sticking
Can you use a match stick and clean it out in the Headphone jack. Your trying to get a switch on the side to loosen up.
Let me know if you can please,.
Click the apple icon then select System Preferences> Sound > Click on Internal speakers. Then at the bottom set audio port for "sound output." Change to headphone then test if that does not work the port is dirty. We can clean it by inserting and removing your headphones 20 times ( as fast as you can) That should clear out any debris inside.
The next step will be a reinstall of the Mac, do you have your data copied off it (programs you need to install again)
yes, but you should have these backed up anyway.
Do you have an external drive available? To copy these too?
I can see you are a first time user to the site. What we do here is either a question and answer type of conversation or remote support where I would actually connect to the computer and have a look and attempt to fix the problem for you.
Remote support can save a lot of time if you are not comfortable performing repairs yourself. Sometimes even with instructions you can make a mistake and make things worse.
I will send an offer through for remote support and should you accept I will connect and see what is going on and fix the issue. Otherwise we can continue to talk like this but I will need to ask a number of other questions and try and walk you through some steps.
Both options are 100% guaranteed by the way. Remote is just quicker and avoids the risk of you making a mistake and doing something wrong.
If you want remote click get extra help. If not simply reply to me.