Mini displayport to dvi adapter not working

hello,
I have both a 2008 Mac Pro tower with 2 Apple Cinema Displays, and a newer MacBook Pro that I'd like to hook up to one of the monitors.
The 2 monitors are both DVI, so I bought a mini displayport adapter to plug into the thunderbold port on the MacBook Pro and the other end to the monitor.
When I plug it all in, I get no video on the monitor. I am sure the monitor works, I'm sure the cables work (from the monitor), not sure about the adapter (I just bought it, so it could be bad)....
I did see quite a bit of the same issue online, thought I couldn't find any help in fixing it.... short of driving back to the apple store and replacing the adapter, I'm wondering if there's anything else I should do to trouble shoot this....
I've restarted the computer, checked all connections, nada....
help??

The problem was simple: my laptop wasn't plugged in...
The desk where the Mac Pro is isn't where I typically use my laptop, so I carried the laptop over and plugged the monitor in, when that didn't work I looked online and checked here- I also returend the original adapter to the apple store. I inquired about it there, and the genius asked if my laptop was plugged in when I tried it out... sooo when I got home I tried it again with the new adapter and with the laptop plugged in, and it worked right off the bat with no trouble shooting or "detect display" necessary...
The laptop must be plugged in for the external monitor to show up...
now I know.

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Mini-Displayport to DVI adapter not working, but Mini-Displayport to VGA and Thunderbolt work fine

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This is a brand new MacBook Pro (15-inch, mid-2012) just received. I suspect that this is a hardware problem as:
The mini-displayport to DVI adapter and the external monitor that I am utilizing connect and operate just fine using my older MacBook Pro (mid-2010) with the same OS.
The new MacBook Pro powers the external monitor with a mini-displayport to VGA adapater without issue.
The new MacBook Pro powers an Apple Thunderbolt display without issue.
Both MacBook Pro's are running OSX Lion 10.7.4.
The only combination which does not work is the mini-displayport to DVI adapater used in conjunction with the brand new MacBook Pro (mid-2012).
All adapters and components (mini-displayport adapters) are Apple retail adapter.
I have tried several external monitors, including my Dell U2412m.
When I connect the mini-displayport to DVI adapater to the new MacBook Pro (mid-2012), nothing happens. The external monitor reports "no signal" and attempts to go into sleep mode. Using the "Detect displays" button has no effect, even when used multiple times. Rebooting does not help, nor does resetting the SMC or PRAM.
Any other suggestions before I take it to the Genius Bar?

I turns out that the logic board of my MacBook Pro was faulty (despite being brand new).
I took it to the Apple Store, presented the problem, and one of the Tech's came to the same conclusion that I had -- hardware failure. Phone support was no help in the matter (and even told me that what I was trying to do wasn't a supported option, which is rediculous). However, the Genius Bar did take care of the problem, and my MacBook Pro was back to me with a replaced logic board within a few days.
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I iMac Apple Mini DisplayPort to DVI adapter suddenly quit working after I installed Apple's latest iMac display firmware update. This is an Intel Core i5; the monitor is an LG Flatron 24" Wide, and when it powers up it says "no video input" and goes into power-saving mode. No amount of replugging cables helps, but the monitor works fine on other computers.
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Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 512 MB
Vendor: ATI (0x1002)
Device ID: 0x944a
Revision ID: 0x0000
ROM Revision: 113-B9110C-425
EFI Driver Version: 01.00.383
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Mirror: Off
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Some firmware update installations can be interrupted/corrupted by attached devices. If you find the update's installer on your iMac, I suggest that you detach all external devices from the iMac, use an Apple USB keyboard & mouse if available, follow the instructions carefully and install the update manually. If you do not locate the installer I suggest downloading manually from the link below and installing it.
The Knowledge Base article mentions that your iMac should also have a Graphics Firmware Update. I suggest that you download and install that as well.
27-inch iMac Display Firmware Update 1.0
http://support.apple.com/kb/DL998
27-inch iMac Graphics Firmware Update 1.0
http://support.apple.com/kb/DL984
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Hello fuzzymelton,
The article linked below details a number of useful troubleshooting steps that may help get the additional monitor to function.
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http://store.apple.com/us/browse/home/shopmac/macaccessories/displays?mco=OTY2ODUwNQ
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Thanks CellarDwellr.
I live in Vienna and things are always different here.
We do not have any Apple Store but a company that represents Apple called McShark.
I went to them with the adaptor and they said they needed my MacAir serial number in order to send it in. Never heard that in order to replace a faulty cable one needs also the serial number of the machine, did you?! ...
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Mini displayport to dvi adapter not working

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