hook it up as internal and use mfgs diags to test. If it's OK...maybe you can put the drive back into another external enclousure ... many to choose from.
Let us know what you find.
I have a Maxtor External hard drive 80gb 5000LE USB. It worked fine for a while. Then, for some unknown to me reasons, it stopped working: ie, it is not being recognized / it is not showing up in my computer.
I have reinstalled the drivers; I have tried to connect/disconnect/power up and down/ plug in different computers/use different cables. Nothing happens.
If the drive is dead, is there some way to check that?