Yesterday I clickeed on Enable Wireless in the Network Manager.
This caused the wireless to disappear as I wanted and the text in the Network Manager got dimmed.

My problem now is that I can't get the wireless to work again!!
The Network Manager don't react on any sort of clicks.

Is there a way via the terminal that one can enable the wireless again??
Please help!

I am running Ubuntu 11.10 on a HP Compaq nc4200 laptop and have had no problems with the wireless before.
The problem is not caused by the hardware switch which can switch the wireless off.