https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/20D-Going-Ghost/m-p/115251#M14089 <P>It's been a long time since I shot my 20D (my daughter still has it &amp; uses it) but I do remember having problems if the ON / OFF switch was just a bit less than in the ON position. It may look to be in the ON position but see if you can move it even more ON or switch it off &amp; then back ON. Also I guess the date / time battery could cause problems when it goes dead but I don't know just what problems so check your manual if my first suggestion doesn't fix it.</P> Fri, 19 Sep 2014 02:08:48 GMT cicopo 2014-09-19T02:08:48Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/20D-Going-Ghost/m-p/115241#M14088 <P>I have&nbsp; canon 20D and just this past weekend i was shooting a concert when all of a sudden my function buttons stopped working. The camera is still completely operable but im unable to change my ISO and any other "Main" function. Anyone have any recommendations on what i could do to possibly repair this or is it safe to say its time to retire my 20D?</P> Fri, 19 Sep 2014 00:07:44 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/20D-Going-Ghost/m-p/115241#M14088 ashleyterese 2014-09-19T00:07:44Z https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/20D-Going-Ghost/m-p/115251#M14089 <P>It's been a long time since I shot my 20D (my daughter still has it &amp; uses it) but I do remember having problems if the ON / OFF switch was just a bit less than in the ON position. It may look to be in the ON position but see if you can move it even more ON or switch it off &amp; then back ON. Also I guess the date / time battery could cause problems when it goes dead but I don't know just what problems so check your manual if my first suggestion doesn't fix it.</P> Fri, 19 Sep 2014 02:08:48 GMT https://community.usa.canon.com/t5/EOS-DSLR-Mirrorless-Cameras/20D-Going-Ghost/m-p/115251#M14089 cicopo 2014-09-19T02:08:48Z