My viewfinder does not always work, I turn on the camera and it won't turn on, then I take out the battery, put it right back again (without charging it) and it works. The next time it may or may not

SOURCE: Pentax Optio 555 - Fozen with the lens stuck-out

happened to me a couple times & after recharging battery, still stuck, so manually pushed it in when motor was running trying to close it.

SOURCE: SCREEN AND VIEW FINDER BLANK

Is the battery dead? Try taking it out and charging it, then put it back into the camera.

Also, you can try using another battery of the same type.

SOURCE: Lens error causing camera to not work, HELP!!!

I just had the exact same problem on a friend's Exilim EX-Z75. Since it was useless as is, I was asked to investigate. It turned out to be a mechanical problem in the lense. I'm not too sure if it was a misalignment of the servo motor or if a gear popped out of a guide hole. In any case, if your lense goes in and out as it normally does, the problem is not in the main motor, but in a smaller internal secondary motor that adjusts the focus. Only try this if you are comfortable working with small tools and have plenty of patience. Took me about 3 hours start to finish. Warning: there is a capacitor that can hold a good enough charge to give you a jolt, possibly causing you to drop or damage the camera beyond repair, or short out your pacemaker. Keep your hands clean and avoid touching the circuit board and lense and display surfaces. Just in case you do get the camera working. Cycle the power button until the lense retracts completely. Remove the battery. Remove the case screws (6 on the bottom and 8 on the sides) and carefully remove from internal camera. The lense assembly is held in by some soft spongy spacers and a clip on the bottom corner of the lens compartment. Push the clip and the lense assembly should flip up revealing the back of the lense. Be careful to not put too much tension on the flexible circuit board. The CCD (that captures the picture) in the middle is held on by two screws. Remove that first letting it sit in the lense compartment. Then there is a circular plate that will reveal the focusing motor and gears. Remove the 6 screws and carefully remove the plate. There is a small motor and 3 gears that will be exposed. The center one might pop out. If it does, the small gear on the dual gear assembly faces down. You should be able to pick up the center focus unit high enough to make sure that the focus gears and rods are properly lined up in their guide holes and check to make sure none of them are stripped or out of alignment. The focus rods should be paralell to one another on the side of the focus unit. This is what I believe is causing the lense error problem. I would suggest after checking the alignment that you manually turn the gears so that the lens is all the way up. Turn the brass gear on the motor to make sure that all the gears are turning and moving the focus lense. If you think you have everything aligned properly, it's time to re-assemble the camera. Once you have the back plate and CCD put together, you could try to put the battery back and power up. If everything is ok, you should see a picture on the display and be able to take a picture. (Watch out for that capacitor.) If not, you might want to take it apart and recheck the alignment of the focus gears again. I had to do it twiceeven though it looked ok the first time. Remember, anything not lined up properly in there will cause the camera to malfunction. You should also have a greater appreciation for how sensitive a camera can be. DON'T DROP IT! Good Luck. Phil

SOURCE: Canon Rebel XTi won't turn on, and its not the battery. Help?

It just happen to me, again. I removed lens and turn on camera. Try it.

SOURCE: CANON G6 NOT WORKING at all - BATTERY CHARGED

My daughters camera had a very similar symptom, I'm an engineer and took a crack at it...what I found was a couple of things.

1. If all the doors are not completely closed nothing will come on..little safety mechanisms on battery/CF doors.
2. There was a broke (ribbon) connector on the LCD/Electronic viewfinder, still not sure if the very..very small copper traces are mis-aligned possibly causing a short or disconnected. But removing the ribbon cable allowed the camera to boot up and display on the top LCD panel.
3. She/someone had broken the internal parts of the rotary dial that is used to select the camera mode. So while it's powered up, not sure if it will take any pictures.
If you check/double check on the 1st item and don't have success. It's most likely due to something like the other two listed or moisture damage, etc.
It's spendy to take it to a shop for repair as they have a hefty overhead they have to cover. If you must have this one fixed, be prepared for a $100.00 bill more or less, you can buy used G6s for about the same amount. If you have a techie friend...let him have a crack at it..he may confirm what I told you for free or maybe just lunch, if he's a really good friend he may go the extra and try to locate replacement parts on the net. The best thing is the find another broken camera same model and give them both...see if he can make one out of two. I did this with one of my PDA phones.
Good luck...