Mini-DVI to HDMI Cable Not Recognized...

Hello all!
I just bought http://www.amazon.com/gp/product/B002LEY28O/ref=oh_details_o00_s00_i00?ie=UTF8&p sc=1 from Amazon.com and it arrived today but when I plugged it into my iMac (Early 2008) literally nothing happens. I have tried power-cycling everything, starting up things one at a time, everything. (Searched the internet to!) Here's the specs of my stuff:
iMac (Early 2008):
2.4 GHz Intel Core 2 Duo
ATI Radeon 2400
2 GB 800 MHz DDR2 SDRAM
1 mini-DVI output port
||
I am currently staying in a hotel so I do not have all of my usually electronics but I have tested it on an LG HDTV and a ViewSonic HD computer monitor and both do not work, it just display "no signal" and the iMac doesn't know that anything is different, the blue screen that is supposed to fade simply doesn't and under the "display" section there isn't an "arrangement" tab and clicking "detect displays" just freezes my computer (cannot move mouse) for 1-2 seconds. I ruled out the HDMI cable that I have by using it with my Xbox One and it works fine. Any suggestions?
Thanks Everyone!
Also, you do not have to explain it to me like I'm 5. I am well capable of making my way around a computer.

Hello Ratnik,
I'm having the same problem. Below is my question.
If you get any closer to a solution, might you please send me the result?
http://discussions.apple.com/thread.jspa?threadID=2456882&tstart=0
Thanks,
Stacey Bindman

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At the minute I'm pulling my hair out!!
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I have telephoned numerous companies on the net and they have never heard of a mini dvi socket (like the one on the back of the imac)!! Apple say I need a mini-dvi to dvi female cable but of course they don't sell them.
Guys what do I need, and where would I get it? I've already bought a HDMI-A Male to DVI-D Male cable but it doesn't fit the mac, is there an adaptor I can buy or do I need a new cable also?
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Difficut to say why it won't work, but my guess is your vintage iMac (about 2007) was never designed to output via HDMI. Your adapter appears correct (thanks for the Amazon link) so if you want to persist, you can contact Amazon and request and exchange to check it. But I suspect you will need to use VGA or if your TV has it DVI which would mean using a mini-DVI to DVI adapter.
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Thanks for that. I have a Y adapter (3.5mm stereo headphone jack to RCA sound just like you said). Under input options on my TV, I can select either HDMI1 input (which gives me video only) or AV1/S input (which gives me audio only) - not both at once...Could you explain how I can get stereo audio on my TV?

Mini-DVI to HDMI Cable Not Recognized...

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