what can i do the external mike socket on my laptop has stopped working..i cant get any audio om my microphone

Well you can...

1. Replace the port yourself. *
2. Take it to a tech and have it replaced. *
3. Get a 3.5mm to USB adapter and connect the mic through the USB port.

* = If the device is under warranty, then contact the manufacturer rather than doing any work/having any work done on it.