The iMac doesn't recognize my external hard disk

My iMac doesn't recognize my external hard disk. The iMac also keeps a DVD inside. It doen't throw it out despite "eject".

Sounds like you might need to make that call. In the meantime here are a few of things you could try that may help:
To eject the disk try a restart holding down the mouse button - hopefully it'll eject.
If you are running either Mountain Lion (10.8) or Lion (10.7) try booting into the Recovery HD:
Restart holding down Command+r. At the screen with 4 choices choose Disk Utility and then select Macintosh HD and click on repair disk. If it fixes anything click on repair disk again until you get a clean pass. Restart as normal from the Apple menu.
If you are running an earlier OS you would normally carry out this process by putting the grey restore disk that came with your Mac in the Disk drive and restarting holding down the C key. Choose your language and at the next screen from the menu bar select Utilities>Disk Utility and then follow the above instructions (I realise you won't be able to do this if you have a disk stuck in the optical disk drive).
Try an SMC and PRAM reset: https://discussions.apple.com/docs/DOC-3603
Try a Safe Boot: Restart holding down the shift key until you see a grey progress bar. Once it's booted restart as normal from the Apple menu.
If none of this helps, I guess you need to make that call. Good luck.

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