It might be that you need to reconnect the folder in Lightroom with the External Drive
Also first try to disconnect and reconnect the external drive once.
Please check the following link : Adobe Lightroom - Find moved or missing files and folders
hi tanuj, thats for getting back to me with a responce..
the problem is I'm not even getting to the stage where my images are not being recognised. the problem is once I've saved then to my external hard drive, opend lightroom up and tried to open catalog, i can chose the folder with the catalog in it but nothing happens...!!! its almost like the folder is empty, its doesn't even load the images up with a question mark next to it...!!!!
I am sending you a private message please check.