No sound coming from my Macbook

Two days ago, my Macbook (the Original white 13" one from 2007) had a Kernel Panic, and I had to restart it (OS X quit) When I turned it back on, no sound comes out from it from iTunes, Youtube etc. When I hit the volume up/down button, its all grey with a circle with a line through it like this:
http://entrepreneurthearts.files.wordpre…
Usually this happens with my earphones and then there's a red light flashing in the earphone port, but theres no light this time. And if I try using my earphones, nothing happens.
Also, my laptop is also over heating in a normal room right now, its at 74 degrees celcius and the fan is up full speed. I understand that my laptop is 5 years old, but are two problems related to the Kernel Panic as they both just happened after?
Please dont tell me to update my computer, as I did that before, something went wrong and my laptop broke and cost over 200 euro to get fixed! I'm getting an iMac in August so it'll do untill then!
Sorry for being so confusing haha.
Thanks in advance,
Hannah

Hi everyone
Check the audio output port and see if there's a red light. If there is then the port is stuck on optical digital output. This is controlled by a little switch inside the socket which sometimes gets stuck. While stuck in this position, the usual audio controls don't work
Plugging and unplugging a headphone plug into the socket a few times may be enough to unstick it - other users have reported success using a toothpick to feel inside the socket at the 3 o'clock position.
Bob

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