Lens error 12 & 25 at first, now the unit won't power on unless it's set to playback mode
For quick reference, here is a copy of your owners manual http://support.nikonusa.com/app/answers/detail/a_id/14051/~/user's-manual---d80---guide-to-digital-photography Solution 1 • Unlock focus area selector. • Auto-area AF selected for Custom Setting 2 (AFarea mode): choose another mode. • Press shutter-release button halfway to turn monitor o?¬? or activate exposure meter • Memory card is full, locked, or not inserted. • Flash is charging. • Camera is not in focus. • CPU lens with aperture ring attached without locking aperture at highest f/-number. • Non-CPU lens is attached: rotate camera mode dial to M. • Mode dial rotated to S after shutter speed of bulb selected in mode M: choose new shutter speed • P, S, A, and M modes: lower ?¬? ash. • Digital Vari-Program modes: turn ?¬? ash o?¬? Turn long exposure noise reduction o?¬? Turn long exposure noise reduction o?¬? Press multi selector up or down or rotate sub-command dial to choose photo information displayed Select All for Playback folder. Note that Current will automatically be selected when next photo is taken • Select On for Rotate tall. • Photo was taken with O?¬? selected for Auto image rotation. • Camera orientation was changed while shutter-release button was pressed in continuous shooting mode. • Camera was pointed up or down when photo was taken Use Nikon-approved card. • Card may be damaged. Contact retailer or Nikonauthorized service representative. • Delete unwanted ?¬ les or insert new memory car after removing and replacing the memory card and powering off then back on your cam, you may see how the system now registers your photos will having to click back and forth between AUTO and MAN. I posted very closely related troubleshooting steps to take in order to prevent your CAM from performing badly. Check your CAM batteries to ensure they are using only approved NIKON batteries as anything else will cause you lots of errors and potential problems. When you using the timer or remote options, remember these are controlled by battery as well, radio frequency, and radio wave lengths. When you press the button to take a photo, inspect the button, press firmly for a second and release. If your button is not performing the way it should, inspect it to see if any wear and tear is visible to you. Check free deprey around the button such as DUST, HAIR BUILDUP, and small particals that are hardly visible to the human eye. With very low velocity pressure air, blow around the shoot button as build up will cause the same error your experiencing.