My D90 about 2 years old has taken about 10,000 photos and done very well. recently i was shooting and the viewfinder went dark (not black) but dark as if it had been stopped down. i have removed the battery and recharged and reinstalled (more than once), looked through all the A,b,c,d settings and they are all nominal.
ALso seems to not be taking photos as per normal.
Am looking for suggestions on fixes i can perform prior to just sending it back to Nikon for repair.