Got my new HTC Desire C a few days ago. On the incoming call screen, when I press 'answer' - every other call connects but the screen goes blank. Can't access keypad, can't press end call, can't access speakerphone, can't access home -NOTHING but hearing the call on the other end. When I say 'every other call' , I mean incoming call A goes through fine, but then incoming call B goes through to a blank screen, call C goes through fine, etc. The only way to end the call from the problematic 'blank screen mode' is to either end the call with the top power button, or wait until the caller hangs up, at which point the screen goes back to normal. Spoke to HTC and they told me to do a factory reset, which didn't help. All I can do now is take the phone back, but I bought it on ebay (boxed new from a reliable seller) so this isn't so simple PLEASE HELP!!