SOURCE: nikon fm10 35mm SLR developed pictures turn out white
That sounds like your shutter isn't opening. take the lens of and set the shutter speed to B this should keep the shutter open as long as the release is pushed down. advance one frame and hold down the shutter release while looking at the opening where the lens should be. If the shutter opens you will hear it and see the back plane where the film would sit to be exposed. I expect your shutter won't open.
Good luck
Rob
SOURCE: i have a nikon fm10..when
Does this fault happen only with that lens? Also, you're wrong about the shutter: it appears you're mistaking the shutter assembly for the lens diaphragm (also known as the "iris").
Older lenses often have sticky diaphragms, usually due to oil migrating onto the individual blades and sticking them together. A sticking diaphragm can interfere with the shutter operation on some SLR's.
Fixing a sticky iris is usually a professional job, but if you're careful then with a simple non-autofocus lens like yours it's often possible to do on a DIY basis but will be very fiddly. The object is to get to the iris blades and to then thoroughly clean them. They're Teflon coated so should slide over each other without lubrication, but their pivots normally need the tiniest bit of lubrication. If you try and fail then you've lost nothing as the lens was effectively scrap anyway and there are plenty of cheap/free replacements around.
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