My cannon s21s has a blank screen

Probably not...sounds like you did about all you can do.

First press the DISP or DISPLAY button to see if that corrects the problem. If not, a stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, sometimes with lines, especially when taken outdoors (for shutter stuck open).
To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.

http://camera.manualsonline.com/support/canon/digital-camera/manual-1637162

you might find what you need here
hope it helps

I think it is because the camera has a sensor. The screen turns off so as not to distract you or let light from the screen bother you while taking a shot. You can check this in the manual.

Try using a card reader to download the missing 1000 pics. In the future, don't leave so many pics on the card...they aren't made for long storage.

If camera shows Menu item or any on-screen display in LCD but no live view to take picture then it can be either aperture problem or defective ccd imager.
And if you do not see any display icon in LCD then of course LCD section is bad or LCD back light is Off for some reason. Try to see faint image in LCD if it is totally blank by pointing good amount of light with flash light or some thing.

My i85 camera's lcd no longer displays what you are looking at. Just a black screen. All the menu items are there and working. The battery is charged. The power button is working as well as the lens open, but no image is available just a black screen. When I I try to take pic is showed very low light but doen't show image of pic taken when I check. Please advise. This a brand new camera and was taken excellent pic as of this friday. [email protected] Mr.Tracy Johnson

if ur pics are also blank as ur viewfinder when u see them on pc then it is a

CCD FAILURE !

dont worry u are eleigible for free repairs it is a manufac fault just see the link and call canon in ur area they will repair it free of charge dont worry if u are out of warranty or ur model is not mentioned on the list just call them everything will be ok PLS RATE ME FIXYA for help

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=221&modelid=8288&keycode=2112&id=29819

Please see similar problem titled "black screen". Welsbar posted a possible solution as a clarification request. It involves switching your picture mode to TV and changing the shutter speed to 15 seconds, depressing the shutter button for 7 seconds, then opening battery enclosure. Repeat as necessary - I did this twice before I started to see anything on the screen. Twice more before photos start to look okay. Don't know yet if this is a lasting solution, but at least now I can start using the camera again and find out!

According to Welsbar, the problem is an internal part (iris?) that gets stuck when camera hasn't been used frequently.

When you turn your camera on to the right of the view screen is the menu button if you press the far right icon it should turn your display on and off.Refer to page 21 on your owners manual.