Brand new Macbook 13" - external display won't detect through mini dvi-dvi

As per title, it's a brand new Macbook 13" white plastic, (so version is whatever the recent model is.)
As the adaptors are an absolute rip-off, my brother posted me his old one, which he swears was working, and I have no reason to disbelieve him. I've not got another mac to test it on. If it IS the adaptor, then I'll just have to mortgage the house and buy a new one, but I'd like to rule out anything first...(why DO Apple insist on making what must be several thousand % markup on Chinese stuff when it's an essential thing that should have been provided with the Mac like they used to? Anyway....)
What happens is that it either flickers once, or just does nothing. Either way, it doesn't detect another display. Anything else I could or should try before I splash the cash?

How are you getting from miniDVI to HDMI? (adapter(s) type?)
Have you been able to test your macbook on another tv (or DVI monitor?)
It could be a software thing (e.g. related to a system update) as in this thread:
Macbook (Late 2007) External Display Not Working
http://discussions.apple.com/thread.jspa?threadID=2055760&tstart=45
Or it could be something else entirely more mysterious:
Macbook stopped working with a certain specific display (external DVI)
http://discussions.apple.com/thread.jspa?threadID=2081807&tstart=0

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Details atta
<Edited by Host>

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Hello fellow Mac users, I've been a long-time Mac user and owner.
I just got a new MacBook Pro after using a 2006 model for 2 years and am having a display adapter issue that I need help and advice with:
The new MacBook Pro has the mini DVI display connector, my non-Apple external display is does not support the mini DVI, no problem there, I bought the display adaptor...
Except that it doesn't fit the adaptor that fit the 2006 MacBook Pro.
Please See Image at Link:
http://picasaweb.google.com/lh/photo/sdjOcw1jrddqtAfjAU0Trw?feat=directlink
File comment: This is the adaptor that connected my 2006 MacBook Pro to the the display. It changes the connection from the Mac's DVI to fit the VGA connection of my display. There are the four extra pins around the flat pin to the left of the connector.
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Please See Image at Link:
http://picasaweb.google.com/lh/photo/4bG788QVKGCOIJUkzHcjKg?feat=directlink
Comment: This is where the problems begin. The flat portion lacks the four holes needed for the DVI to VGA adaptor to connect.
Is it possible to just remove the four offending pins in the Full Size DVI to VGA Male End?
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Hi Rob with a Mac and welcome to the boards.
My suggestion would be that you simply take the adaptor back and get a mini-display port to VGA adaptor instead.
I ran into a similar problem myself recently when I wanted to connect my own MBP13 to an overhead projector. I had assumed that I could use the mini display to DVI adaptor that I use for the DVI capable external monitor with my new MacBook, combined with a DVI to VGA adaptor that I had for my 2007 MBP, connected to a VGA cable to do the job, but this is not possible.
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Brand new Macbook 13" - external display won't detect through mini dvi-dvi

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