I have found that most lock-up problems are the result of some obstruction (sand, grit) or perhaps impact damage. Send it to me for a N/C estimate. I've been in the camera repair business for over 30 years. www.flcamerarepair.com
I have found what seems to be a common thread amongst most "lock-up" or "turn camera off" problems. It seems that although we are told that we can use common alkaline batteries, once we do it is only a short matter of time before the camera begins to break down. I have found amongst my friends with the same camera who have stuck to the oxyride batteries that they are not having problems with their cameras. My suggestion, stick to the oxyride batteries. Overall they last longer anyhow, you just have to pay a little more upfront.
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First, make sure you're in the manual exposure mode, not manual focus mode, as set by turning the mode dial to the "M" position. In manual exposure mode, turning the main command dial should change the aperture, while turning the subcommand dial should change the shutter speed. If the two command dials don't have the expected effect, reply to this post and we can troubleshoot further.
The lens is supposed to be locked at its smallest setting (largest f/number). You can control the aperture from the camera body, the same was as on a lens without an aperture ring. For example, in aperture priority mode (A), simply turn the command dial. In manual mode (M), hold down the exposure compensation button while turning the command dial.
That was for a lens with the electronics to communicate with the camera. If you have a purely mechanical lens, you must shoot in manual mode and control the aperture by turning the ring on the lens. There should be a small orange slide near the aperture ring, Slide it toward the front of the lens to unlock the ring.
If you need more help, please feel free to reply to this post. Please specify the lens when you do.
In all modes the aperture ring on the lens should be locked at the smallest aperture. In the M and A modes you control the aperture by turning the command dial on the front of the camera. In P and S modes you control the aperture indirectly by turning the command dial on the back of the camera.
In the Basic Zone modes, you don't. The camera automatically sets the ISO in the range 100-800.
In the Creative Zone modes (P, Tv, Av, M, and A-DEP), press the ISO/Flash Exposure Compensation button (rightmost button in front of the top LCD panel). This will display the current setting on the top panel. While looking at the top panel or in the viewfinder, turn the command main dial (just behind the shutter release button) to change it.
To save battery power, the camera automatically goes into sleep mode and the monitor turns off if there is no operation after 3 minutes when the camera is turned on (when the lens cover is open and the monitor is on). No picture is taken even if the shutter button is fully pressed in this mode. Operate the zoom button or other buttons to restore the camera from sleep mode before taking a picture. If the camera is left on for 15 minutes, it automatically turns off (the lens cover closes and the monitor turns off). Press POWER to turn the camera on.