I have a late 2009 27" iMac with 16gb ram, i5 processor.... The graphics card started to fail (or so apple told me). Rather then put money into an older machine, I bought a new one today. My question is, is an older iMac worth anything? If so where would I sell it? Another thought I had was maybe I could use it as a second monitor, but then I remembered the failing graphics card. I guess I could repair it if it could be used as a second monitor or as a primary with a Mac Pro. Thoughts?