On my G4 I have an ADC display out and I was hoping to use it as a second monitor (seeing how my other DVI port is being used by my first monitor). Is it possible to use an adapter to make it connect to a VGA?
You will need a ADC to DVI adapter
<http://www.amazon.com/Belkin-F2E9142-WHT-Apple-Monitor-Adapter/dp/B000067RLH/re f=dp
cp_ob_title0>
or ADC to VGA adapter
<http://www.amazon.com/COMPUCABLE-ADC-VGA-Adapter-Cable/dp/B000071A8Q>
ADC to VGA adapters have become very scarce. If you have to use a VGA display, you can use a DVI to VGA adapter on the computer's DVI port. You can then connect your DVI display to the ADC port with the ADC to DVI adapter. (A DVI to VGA adapter won't work connected to a ADC to DVI adapter, since the ADC to DVI adapter doesn't pass the analog video signals needed for VGA.)
The Belkin F2E9142-WHT will only give to a DVI-D, You will need a DVI-I port to convert from DVI-VGA.
I am in the same boat, try to connect a VGA monitor to the ADC port, it seem to be an impossible task. I have an Apple 15 monitor on the ADC port now, would like to get a 19 inch VGA on the ADC port to go with my other VGA 19 inch monitor. So far I am hitting brick wall. Only choice is a Apple 20 in display.
Here is one ADC to VGA adapter
<http://cgi.ebay.com/Griffin-ADC-to-VGA-Video-Adapter-Good-as-DR-BOTT-NR_W0QQite mZ180270165237QQihZ008QQcategoryZ42160QQssPageNameZWDVWQQrdZ1QQcmdZViewItem>
The last one I saw listed retail was $140.00, so the bidding may get ridiculous.