Dvi to DVI

Hello
I have an Sharp Aquos HDTV, It has a DVI input.
I have a PowerPC G4 with a DVI slot.
My mac reconizes the TV by name (SHARP LCD) but displays no picture.
I just got the TV back from the repair shop today and they had it working. This computer does not have a mini-DVI cable so I am forced to use the larger one.
The cord that I am using goes from DVI to VGA and then back to DVI again. There should be no problem with the cord because is works no problem on another setup.
I have also tried a different computer, a Powerbook G4 with a DVI slot. I have tried every display setting on these two computer but with no luck.
Any thoughts from anyone would really be great.
Thanks

You have posted in the iBook G4 forum, but your message says you have a "Powerbook" with a DVI slot. Some PowerBooks do have DVI slots, but not all of them. The iBook does not have a DVI slot.
I see you've also posted in the MacBook forum, but the MacBooks have Intel processors, not a PowerPC "G4".
Before anyone can give you some informed advice, we're really going to need to know exactly which hardware you do have and which version of Mac OS X you're using (so we can point you to the right screen or window to help). I would suggest you choose "About This Mac" from the Apple menu. Which version of Mac OS X do you have? Next, click the "More Info" button. Let us know what the "Hardware Overview" says about your computer. What is your "Machine Name"?
You will also not be able to use a "DVI to VGA to DVI" set of cables because it's not possible to convert VGA signals to DVI signals without some kind of adapter or computer in between.
-Doug
EDIT: I see from reading some of your other posts, you must have a 15" PowerBook G4. If this is the case, you simply must use a DVI to DVI cable. Putting a VGA adapter in between will not work correctly as all the digital signal of the DVI will be lost.

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