Really. But give this a try. Go into the menu and format the memory card while it's in the camera. I've run into a few that need this monthly. Those cameras were cycled out of the fleet as the junk they were.
I got a no name dash cam at a discount warehouse for 15 bucks. It's been working amazingly well for three weeks. Then it showed a bank white screen and that was it. Two days later it started working again. Any idea what this is about?