Interesting, the link you were given has a similar test within it but to get to it you have to reset and then when the apple logo appears hold down the centre and the rev buttons. When you do that the apple logo reverses and you get a list of tests as shown in the link you were given. I'm guessing you haven't done that?
I haven't ever seen a diagnostic test come up on screen without going into diagnostic mode but perhaps there is some simple test built in just to test accessories.
Usually with the other tests you just do whatever is asked and you get a pass or fail. You can usually exit by doing a reset where necessary or sometimes by pushing the menu button but you've probably tried that.
The other option is to do what it asks and see if you can exit by going through them.
"Please plug FW" means plug in a firewire cable, connected to something probably, so if you have one, plug it in.
LCD ID:1 simply means your screen is connected.
FWPWR:0 means that your ipod is not drawing power via a firewire connection.
If you plug in your firewire cable it should change to a 0.
It is possible that will be the end of it or alternatively you will get another screen asking you to plug in your usb cable and possibly your head phones and a remote.
Hopefully the remote test will be optional because you may not have one!
In these kind of tests a 0 means no or not present and a 1 means yes or working ok or connected.
Having written all this, probably the quickest way to find out how to stop it is to call Apple!
If you get a test for the click wheel you will need to scroll it around and around several times until it says pass or possibly in both directions.
You may get a "key test" which means just push all the buttons.
Good luck and interested to hear what happens.
John
