iMac stuck on logo screen with progress bar half way filled
I want to recycle my old 2009 iMac but I can't erase the hard drive. When I turn it on the logo screen appears and the progress bar starts to fill up, but stops half way. I've already taken it to Apple and the Genius Bar technician said the iMac was done.
I just want to make sure I erase it for recycling. I tried holding down the D key at start up but I don't see the diagnostics screen. Is there another way to erase (or destroy?) the hard drive so I can recycle it? I know the display panel can be easily removed, but I'm not sure how to remove the hard drive if that's the only thing I can do at this point.
Anyone out there have a solution or suggestion?
Thanks,
Jose