Many people suffer from Canon's E18 error (zoom lens cannot extend), but someone recently asked about the E50 error. From Simply Computing:
... there is an error formatting the memory card. The E50 error may appear as a result of camera failure, card failure, environmental problems, or misuse.
From reading a variety of forums, these are actions you might try:
- insert a different memory card to see if that makes a difference.
- in some cases, you may need to install a firmware update from Canon, because the camera is incompatible with the memory card.
- if that doesn't work, make sure you are formatting the card in the camera, and not with Windows or Mac OS.
- chrisbeery suggests: Open the CF door. Locate the small pinsized 'blue' switch at the topmost part of inside the CF door.
Get a flat object, such as a pen, and push this blue pin down (all the way it will go but be careful not to break it) whilst formatting the card.
- An issue with the size of the memory card and Windows XP described by Canon at CF Card Formatting Error Notice.
- Search Google with this term: "canon e50 error"
- if the problem still exists, the pins inside the camera (that connect to the memory card) may be bent or damaged. Considering the cost of repair by Canon (around $250), it may be worth your while to either (1) buy a new camera; or (2) open up the camera and attempt to straighten out the pins yourself.