I TURN ON MY A70 AND I GET A VIEW OF THE LAST PICTURE I TO TOOK.

This sounds like it might be a defective CCD imager. If so, Canon should fix this for you for free, including free shipping both ways. This is regardless of your camera's warranty status. Please check this link for more info.

Applicable cameras include:
A40, A60, A70, A75, A80, A85, A95, A300, A310, S1 IS, S60, S200, S230, S330, S400, S410, S500, SD100, SD110, IXUS V2/300/400/430/500, IXY Digital 30/30a/200a/300a/D320/400/ 450/500

You have it in view mode...change it.

I think your Canon A70 camera does not show live view in camera mode to take pictures but show you previously stored picture properly in playback mode.
If that is true then Canon A70 camera got problem of bad ccd imager that will be replaced to get live vew in camera mode.
Canon will replace ccd imager for free, click Canon CCD Imager Advisory for details.
Thanks.

I had a A70 that would still take pictures, but the screen did not show a picture. I did some research and found that this is somewhat a common problems with some of the Canon Powershots to include the A70 where the LCD screens expire. I believe that if the camera gets too hot, such as being left in a vehicle the LCD seperates. I sent my camera to Canon and they fixed it for free. It took about 4-6 weeks to receive my camera back, and now it works perfectly. They did a great job on communicating with me, and fixing the issue. I think that alone is worth buying a Canon. The link below should help you.

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&keycode=2112&fcategoryid=221&modelid=8776

its a problem with the iris of ur camera and also sumtimes the CCD .... get it repaired from a repairman

Canon has posted a free repair recall of several models (including the A70), due to faulty connections of the LCD screen. The repair will be made regardless of warranty status:

http://www.usa.canon.com/consumer/controller?act=PgComSmModDisplayAct&fcategoryid=225&modelid=13390&keycode=2112&id=29819

Hope that helps!

the fix should be in the set-up menu. Look through for "post-view", which should control whether the image stays on the LCD after you shoot, and for how long.

that happened to my camera... just hit it a bunch of times and sometimes it'll start to work... sorry i don't really have any expert advice, unless the screen just went bad

mine just started doing the same thing a few weeks ago. I had downloaded pixes to the computer, went outside to take picture and it started acting up. strange lines appear on the screen, but the codes are all there, and you can view the pictures that are on the card. no, the card is not full, the batteries are fine. I think it has a virus built in to start trouble so we will go buy a new one!

Here's a disassembly guide for your camera. It's in Estonian, but has lots of pictures to show you the steps to get in there. If you do get it open, try not to touch any of the elctrical connections or you might get a small shock from the flash capacitor.
http://qman.fotokala.ee/Kaamerad/PowerShotA70/index.html