Have 2 A1305 mini to dvi adapters but...

I have two mini display port to dvi adapters; one works wth a VGA cable to an external monitor and the other doesn't on my MBP 2008 late, 5,1.
Both carry the model number of A1305 on DVI end of the plug.     What's up? 
This site has pictures of the connectors  - http://www.hisdigital.com/UserFiles/news/200902261616114965.png
My adapters match the DVI-D picture.
One of teh two operates an ADC 20" Cinema Display.
ls advise.  thx

The first display plugs right into the DVI port on the card and is happy.
The second can be plugged in today, with any-old-adapter, as long as you Never want to run three displays.
If you ever want to run three displays with two adapters, you need ALL adapters to be ACTIVE adapters. Third-party ACTIVE adapters cost only about US$35, so you may choose to go straight to an ACTIVE adapter. In the US, this one is good and cheap:
http://www.amazon.com/Accell-B087B-006B-DisplayPort-Single-Link-Certified/dp/B00 4071ZXA/ref=sr_1_3?ie=UTF8&qid=1363141658&sr=8-3&keywords=ACTIVE+Mini-Displaypor t+DVI
Startech is cheaper in the UK.
http://www.amazon.com/StarTech-com-MDP2DVIS-DisplayPort-Active-Adapter/dp/B004SU ELLC/ref=sr_1_2?ie=UTF8&qid=1363141658&sr=8-2&keywords=ACTIVE+Mini-Displayport+D VI
Single-Link DVI is used up to and including 1920 wide.
Dual-Link DVI is required above 1920 wide.

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