Arduino Uno not able to connect to computer via Serial Port

Hi,

I've been using my Arduino Uno for the past 4 weeks on my Macbook Pro (running Mavericks) and everything has been really smooth. However today, my Macbook fails to show the Arduino in the Serial port. Under Tools -> Serial Port, I don't see the port for the Arduino. I've also tried on other laptops (Windows and Mac), but I haven't had any luck.

The Arduino is still getting power when I plug the USB in.

Any ideas?

Thanks in advance, I'm really looking to get back to working on the Arduino :)

if you try the same arduino on other PC and still can't see it, then i think your arduino have a problem