I got the 24" display for my older iMac with Mini DVI. I thought Apple would have a Mini DisplayPort to Mini DVI adapter, but all they have are Mini DisplayPort to DVI, and DVI to Mini DVI. If I chain both of those adapters will the 24" ACD work with my iMac? Why isn't there is single adapter for Mini DisplayPort to Mini DVI? I thought Mini DVI was the most common port across the Mac line until the recent switch.