Why can I see my external hard drive?

For 2 years or more I've had an external hrad drive to back up my Imac. One day I got a message that there had not beeb a back up for for a really long time ( I have it on automatic).
Ever since, I have not been able to see the external hard drive on mi Imac and have not been able to do regular back ups.
First I turned off, on, restart computer and tried to see if it showed up on another computer, which it did.
What could the problem be? It was working just fine.
Please help
Thanks

EHD's can crash. First thing I'd recommend though is to do 2-3 SMC resets. Shut down the computer, then remove the power cord from both the wall plug and back of the computer, wait 15-20 seconds and restart normally and test.
If that fails use another cable to connect the drive, if that fails open Disk Utility and see if the EHD can be seen. If that fails then replace the drive. I would STRONGLY recommend 2 backups, use Time Machine on disk 1 and then use a create a clone using either SuperDuper or Carbon Copy Cloner on the other drive. When it comes to backing up, redundancy is smart. Would you trust your bank if they only had one form of backup of all your money??

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On iTunes see this...
http://support.apple.com/kb/HT4527
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http://www.ilounge.com/index.php/articles/comments/moving-your-itunes-library-to -a-new-hard-drive/

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Hello Bob,
I have a powered hub plugged into my Time Capsule.
Into the powered hub I have a printer; printer works fine.
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Can you can see the external drive in the finder?
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Have you tried Trashing the iMovie preferences file and re-launching?
Geoff,

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Richard
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   2:          Apple_CoreStorage                         120.5 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
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/dev/disk2
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   1:                 DOS_FAT_32 PASEK                   1.0 TB     disk2s1
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That i want to know is i can connect a external hard drive to apple tv, for see my movies that i keep in my external hard drive, i dont want to see then whit the streaming and icloud, or used my laptop o pc for access de movies and stuff.
i put iny spanish to, because i feel my english is not so good, but i hope you understand me.
if i can´t connect a external hard drive, wich others media players divices you know that can see itunes movies?
¿quisiera saber si se puede conectar una memoria externa al apple tv, para ver el contenido de itunes que tengo guardado en esa memoria como peliculas, ect?
lo que no quiero es usar la icloud, o el servicio streamig para ver mi contenido, ni tener que usar la computadora para ver mi contenido el la tv?
y de no poderse conectar que otros dispositivos media pleyer conoces para ver peliculas de itunes en la tv?

Welcome to the Apple Community.
can i connect a external hard drive to apple tv 3 generation
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Why can I see my external hard drive?

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