70D only autofocusing in LiveView

Something screwy is going on with my 70D and I'm hoping someone else has experienced and solved the problem.

The camera no longer autofocus via the viewfinder. When I switch to LiveView it does autofocus but the screen does not gain-up in dark situations as expected. I reset my custom functions and settings back to the defaults and tested with three different lenses without improvement. I checked that the focus mirror is in position and it looks correct, and I don't see anything blocking the focus sensors.

Just a little sick to my stomach right now.

Before I send it back to Canon I figured I'd post here for advice.

Thanks.

try to clean the contacts in the body ,with a rubber (be gentile ), if not put all batters for 30 mins the main and the clock one in the small slide out holder

I don't think the 70D has a removable watch battery for settings. At least not that I can find.

Pulled the main battery out for an hour, cleaned the contacts. Checked all the settings and now it focuses again. Yay!