Is there a place I can get the hardware diagnostics without the install disc? I have a 2006 iMac that is freezing and once in a while getting a line across the screen. The SMART status showed a failing hdd, after replacing it the machine froze up again right away, but only one so far. I have read all the reports of issues with these machines, and am a little worried now. If not the Apple diagnostics is there something else?