Everything seems fine but won't take a picture, no error message

my canon eos rebel xs works properly for the last 2 years but now faces delayed lcd on problem especially in cold weather

To autofocus the sensor needs a fair amount of contrast (light and dark eges) to operate. If you're trying to take a photo in a dim room of a dark colored subject for instance the focus won't lock and the camera won't take the picture. Try switching your lens to manual focus and shoot that way.

In addition to resetting all the camera settings you should also choose the "clear all custom functions" option that is also available from the same menu. Once that's done. Put the camera in Full Auto mode and see if the issue is resolved.

Sai.

Flash Tube is bad inside the Flah head, tccamerarepair.com

This is a problem known by Canon, you will have to have it serviced.

Error 99 means lens communication error.
Try to clean the contacts on both sides.
and re-install lens

Err 99 usually means your lens contacts are dirty either on the lens itself or on the camera.

To isolate the cause of the issue, do the following: -
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert only a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, the camera may be faulty and requires a service. If it does not, then: -
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99" message appear? If so, then the CF card is faulty. Try a different card. If the message does not appear: -
1. Turn off the camera.
2. Clean the gold contacts on the lens by GENTLY rubbing them with a pencil eraser or soft cloth. Keeping the camera face pointing down, also clean the gold contacts on the camera, being careful that you do not let any debris fall into the camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99" message only appears when one particular lens is attached, then that lens should be examined by a service technician.
If you see the “ERR 99" with a different Canon lens attached, then the camera is faulty and should be serviced.

Hi,

You can reset all your settings and clear errors by removing the battery pack and also under the camera is an access screw to get to a button battery or two. The type of screw you use a dime or quarter to open. With the battery pack out, remove the button batteries and leave all those out for several minutes and then with the batteries still out, activate the On switch for your camera and leave it in the full on position for 30 seconds. That should drain off all residual power from the circuit board inside. You will have to reset everything, such as your personal settings in Tools and the time and date setting. All of those user set items, but your error message should clear too. If you get the error message again, right away, after reinstalling the batteries and battery pack, then you have damaged the Flash Unit... but I doubt that. Canon makes a good camera and I don't think what you describe would cause that problem.

Regards,
Worldvet

The error 5 can mean that there is something blocking the flash from popping up. If it is up but still get the message then you need to check to see if the little black pin/stick that lets the camera know that the flash is up, is not stuck. With the flash up and pointed at you ( like you are going to take a picture of yourself) the pin is located on the right side close to the where the flash attaches to the camera. Yo should see a little pin sticking up. make sure that area is free of dust and /or debris. if it is not up then that is the problem. try to free it with out braking it or get it professionally repaired.

If you dont have rechargable NiMH batteries get these first. Alkalines just dont have the power anymore these newer devices need. If you do have NiMH and yours still having problems try and tap on the lenses as you power it on. As the motors that drive the autofocus and the lens mechanisim wear they draw more current. When this happens the unit draws more power then the batteries can supply and you run into problems. If your camera has a battery pack you may need a new one. They test them new and everything is good on paper but after some use things change.