Internal speakers on Macbook Pro not working after using external speakers

I had an external speaker system attached via the headphone jack, and when i unplugged hem internal speakers are not working, tried plugging external speakers back in and then removing them about 5 times.
There was a read light in the headphone jack but thats gone out now.
I have reset both the PRAM and VRAM twice with no success.
HELP!!!!!
Thanks

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