I have a HP p6506f with a Ralink RT3090 Wireless chipset

Dear all.
Hidden Wireless Networks Are a Pain to Deal With.

I have actually 5 units using wi-fi in the house and one cabled with ethernet.
I am of course using the wired/cabled one to write this.
I inherited the HP p6506f, and I want to make it the 6th unit.
It has a wifi card and I for some technical reason I want to use it instead of the cable one.

The problem I mentioned in the title of this thread is almost solved now. My mistake was that this computer is not like the laptops, smart phones and tablets.

I had forgotten that I had to :
1 Click Wi-Fi Settings
2 Connect to Hidden Network.
3 select New.
4 Enter the Network name,
5 Wi-Fi security type
6 password.
etc.
to connect it to the network.

Now, why is Internet absent only on that computer when all the 5 others have access to internet?