To get your vacuum cord to retract, you'll need to check the power switch. It is often found on the side of the machine and may be a simple toggle switch or a more complex dial. If it is a toggle switch, make sure that it is in the "on" position; if it's a dial, try turning it up until you hear a click. This indicates that power has been restored to your vacuum unit and should cause the cord to automatically begin winding itself back into its casing. If this doesn't work, then there could be an issue with either the belt or motor inside your vacuum cleaner which can only be fixed by calling an authorized repair specialist for help!