When you saved the image to your external hard drive the program you used to do this was able to see the hard drive in order to save to it. If you use the same program to restore the image then it should still be able to see the hard drive. Are you using the same program to restore as you did to save? If you are then why can the program no longer see the hard drive to restore from? Could the external hard drive have developed a fault so that it cannot communicate with the computer? Using File Explorer can you see the external hard drive and image files on it? If you can see it then it will be OK. This begs the question "Why can't your restore program see it?". It may be a USB port fault so have you tried plugging your external HD into a...