No matter what you do, you can't get the battery door to close completely.
If the battery door won't lock into place, it is possible that the lock is already activated. If you lift the battery door back open, you will see a small exposed piece of plastic that can be adjusted by the slide switch on the outside of the door. Slide the lock back until the plastic retreats, and you will be able to close the door. You may have to hold the switch open while closing the door to ensure it does not accidentally slide back into the locked position prematurely.
Brand new batteries will only last a few minutes inside the camera before it shuts off.
One possible cause is that the batteries being used are simply not strong enough for the camera. The best solution to this problem is to replace you current AA batteries with lithium batteries. They will provide the necessary voltage for your camera and will last longer than your standard batteries.
If the battery door is slightly ajar, the connection between the battery and the connection cables may not be properly aligned. Ensure that the door is closed completely so that the battery power is being accessed appropriately and efficiently.
An error message appears on the screen and the lens will not retract.
The first thing you should do is reboot your camera. By simply turning the camera off, the lens may retract and reset. This should allow the lens to properly extend when the camera is turned back on.
If a fall is what caused the lens to stop working, one possibility is that the lens itself is stuck at an angle, which prevents it from properly opening or closing. Using your hand, gently pull the lens forward until you hear it click into place and it appears to be straight. When you turn the camera off, the lens should now successfully retract.
The LCD will not turn on.
Attempt to reboot the camera to see if the screen becomes operational.
If the LCD is cracked or shattered, the only thing you can do is replace it entirely. This link will provide a step by step guide that shows you how to replace the screen.
The shutter button will not press down or presses down too easily and a picture is not produced.
If the button will not press down, it might be stuck due to corrosion. Follow the steps to replace the button, and once the area is exposed, gently clean away and debris.
The button may need to be entirely replaced if it is not working effectively. Follow the steps in this guide to learn how to replace the shutter button.