[SOLVED] Can't Select Serial Port - Linux Mint 17

Hi,

I am trying to get my arduino working but the Serial port entry is greyed out. I am using LInux Mint but I have also tried it on windows 7 and it was the same problem. I know that the board works because I have used it before on my old computer. I have read other posts about roughly the same thing but they were either for windows or they didn't work. Are there any linux users that can shed some light on this? Any help would be much appreciated.

Cheers

I seem to have fixed the issue. I had a circuit wired up and the minute I removed the power and ground wires I was able to select the serial port.