Matrox TripleHead2Go Digital not working with iMac USB
I have a little bit older 20" iMac (purchased around 5 years ago), model number A1174. Processor is 2 GHz Intel Core Duo with 2 GB 667 MHz DDR2 SDRAM. Using Mac OS X Snow Leopard (version 10.6.8).
Our church purchased the TripleHead2Go Digital Edition to run with ProPresenter. We installed the Matrox PowerDesk software and when it said to plug the TripleHead2Go into the USB port it immediately shut off the computer. After disconnecting and reconnecting the iMac's power supply, we were able to reboot the computer with the TripleHead2Go already plugged into the USB connection.
From the iMac we are using a Mini DVI to VGA adapter to connect to the VGA port of the TripleHead2Go and then DVI to VGA adapters to connect to our displays. We can get screen 1 to show up out of the TripleHead2Go, but nothing from screen 2 and 3. Running the Quick Setup from the PowerDesk software states that "one or more monitors (or displays) aren't connected. Hitting the Detect button does not help and there is a check box for "Only use two displays (1 and 3).
Connecting the TripleHead2Go to my PC works fine.
Is it possible that my USB port doesn't have the power needed to make the TripleHead2Go function properly or is there something else on the iMac that needs to be done? I am normally a PC guy, but handle Macs on occasion too. I found that Matrox has a USB Power Adapter Kit for $40 and wondered if that might do the trick.
Thanks for any help!
Ty
iMac, Mac OS X (10.6.8)