My mac mini is connected to my panasonic LCD and the screen has gone blank

So here's what I did.
I plugged my old mac mini (10.4.11) to my Panasonic Viera LCD flat screen with a VGA cable. When it loaded up and i logged in i noticed the screen sizing looked odd - as in looked stetched. I then jumped into the display settings and must have clicked on of the options which for some unknown (to me anyay) reason the screen just went blank. I then cannot do anything as I cant see anything. If I turn it off and turn it back on again then its all good as before untill I have logged in and it loads the desktop - then it goes blank again.
Any ideas?

Look for a solution here:
https://discussions.apple.com/docs/DOC-3353
Ciao.

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