Cause of error code E70
Use our Flashing Lights Wizard. Choose one flashing light as the problem and follow the steps in the solution.
Solution for error code E70
Try the following steps:
Disconnect and reconnect all accessories.
Remove the hard drive.
Remove any USB flash drives.
If these steps don't resolve the issue, you'll need to request a repair. Sign in to request a repair or see Getting your Xbox console or Kinect sensor serviced.