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Any scratches on any mirrors should NOT show up in the pictures, since there are no mirrors in the light path when taking pictures.
The big angled mirror you see when changing lenses flips up out of the way when you take a picture (that's the 'R' in "SLR"). Scratches on it may affect the focusing and exposure metering but will not show up in the pictures.
This is usually caused by a failure of the motor in the SQ unit on the side of the mirror box. It raises and lowers the mirror, ***** the shutter, and operates the aperture mechanism.
There's nothing wrong with your camera. The D40 works as SLRs have worked for half a century, using a mirror to project the image through the viewfinder. The live view feature is a relatively recent development among dSLRs, previously available only on point&shoot cameras.
What lens are you using with the D40? Is it an AF-S lens? And is the Mirror Lockup on? Chech the Custom Settings menu. If mirror lockup is on, turn it off.
That's because the Nikon D40 does not have Live View. Up until a couple of years ago, no DSLR's had live preview, due to the design of a DSLR over a point and shoot, as it has a pentamirror arrangement that effectivly deflects the light path to the viewfinder and only to the sensor when the internal mirror is raised. Early live preview models from Olympus had the world's first Live View system by flipping the mirror so that the picture preview could be seen on the rear monitor. Most manufacturers now incorporate Live View into most of their models but most Nikon consumer models do not as yet, apart from the newly relesed D90. The D40 and D40x are two year old designs and therefore do not have the more "modern" specs of say the Olympus E520 or Canon EOS450D. Most photographers trading up from a compact to a DSLR are surprised when they cannot use the LCD monitor in the same way. However for most aspects of DSLR photography Live View is not something that is used all the time, low down shots, and macro perhaps being the most convenient use, but for general photography there is no substitute for framing through the viewfinder, that's what we've been used to doing for over half a century! Besides as pointed out previously a DSLR is often too heavy to hand hold at arms length especially with a long lens.
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