Without releasing the backup button, plug in the digital box.
If the box is still unresponsive after trying all these troubleshooting tips, call the Sky helpline to speak to a technical advisor.
You could also try booking an engineer visit upgrading your Sky Box.
Do this often otherwise you will be sat there for ages deleting the contents as each deletion is a slow and tedious process.
To delete the contents of your deleted folder: Your box has a section of the hard drive marked as available to you for storing recordings and downloaded programs.
The following is a guide for anyone that owns a SKY HD box who would like to maintain it themselves.