Problem with iMac mini DVI output to TV via VGA

Hi
I've searched these forums and Googled but haven't found the answer to this problem!
Basically, I'm trying and so far failing to connect an iMac that I bought in mid 2007 (v 5.1, OS X 10.6.5) to a new HD TV (Sony KDL-32EX403). I'm using a Mini DIV to VGA adaptor from the iMac with a VGA cable that goes into the 'PC' input round the back of the TV. When I try and select the 'PC' function from the inputs menu on the TV, the icon is greyed out.
No matter what I try - turning mirroring on and off, changing resolution, unplugging, restarting - it makes no difference. Weirdly the display menu does acknowledge that the Mac is connected to a Sony TV and gives a list of resolutions to choose from.
However... when I tried connecting my PC notebook using the straight VGA cable (output on the PC, input to the TV) the image appears fine. So I took the cable out of the PC, screwed on the VGA-DVI adaptor and plugged it back into the Mac and it worked! However when I switched back to TV mode I could not switch back to PC input, the icon was once again greyed out.
Sigh...
I see no reason why this doesn't work without this awkward workaround so if anyone can help or has had a similar problem please shout!
Thanks
Message was edited by: philbrownuk

I have my Macbook (early 2008) hooked up to a 19-inch TV I use as a second desktop. You won't find any cords that go straight from mini-DVI to HMDI, and even if you do I wouldn't recommend them. You'll have to get an adapter cable that goes from mini-DVI to DVI and then get a DVI to HDMI cable. I got the Apple-made adapter (about $20) even though it's more expensive because apparently third party ones can have problems. You can get a DVI to HDMI cable anywhere, they can run expensive but I got one off Amazon for less than $10.
That connection is video only so yes, you'd need a different connection for sound. As to how you hook the sound up, it depends on what you want to use for sound. If you want the sound to come from the TV speakers then you'd have to use a different cord than if you wanted to hook it up to a sound system. If you let me know I can explain what you'd need to do for that. Hope this helped

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