I had a similar prblem with a Mitsibushi Diamond Pro monitor. The picture was not wide enough and so I would increase it, then it was too big. Turn on again next day and start over again.
The problem was the display had to warm up for a few minutes and then it was fine. After I found that it was ok.
One thing you could check is to see what monitor is shown in the display properties. You might need to download the *inf* file from your manufacturer.
If it set to just plug and play monitor it could give the monitor strange settings.