hello I have an older model imac, 15 in.lcd display, 3 years old, 700ghz processor, 256ram .My problem is it has a mini dvi video out port I would like to get working but the new hardware does not support my computer I was wondering if you could refer me ,to perhaps a place online I could find an older adapter , a used mac equipment website , any suggestions are appreciated , I seem to have exhausted most of my options. thanks .