Does a New iMac Always Open With The Correct Screen Resolution?

This may sound a daft question but the other day I visited a friend and when he switched his 2 year old 24" iMac on, I was horrified to see black bands down each side of the screen.
It was obvious he had an incorrect resolution. . . . . I think it turned out to be 800x600!
Anyway I reset it to the correct 1920x1200 and he was amazed at the improvement!
I asked him how it had got like that and he said it had always been that way.
My immediate suspicion was that he had bought the machine second-hand from some idiot who had been fiddling with it but he assured me he had bought it new and that's how it had been from the start.
From what I remember, all my computers have started off with the correct screen resolution and haven't needed any resetting.
Any idea why this happened?

Thanks Barbara and den.thed.
Your suggestions will be helpful for anyone with a similar problem looking at this thread, however, they don't apply in this case. (Hope that doesn't sound bad! LOL)
This friend bought the iMac a couple of years ago simply to edit with Final Cut Pro. He doesn't use it for anything else and it isn't even connected to the internet. (He uses a PC for all mundane chores like that).
He claims that upon initial startup it displayed the 4:3 desktop image and assumed it was normal for his machine . . . . . . . . though he must have seen others in the shops displaying correctly.
Incidentally it may not have been 800x600, but it was certainly an incorrect 4:3 aspect ratio.
As he is a very intelligent and skilled film maker and editor I am surprised that he never queried it, after years of using PCs.

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Does a New iMac Always Open With The Correct Screen Resolution?

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