I'd appreciate any help that users can give me on this issue.
It's a long story, unfortunately.
I bought a Philips 47" HDTV, specifically for use with a pc as a display. I was attracted to the Philips by virtue of the large range of screen resolutions quoted in the spec when used with a pc.
I didn't realise that the TV did not have a VGA input, but since the video card on my pc had a DVI output, I figured I could use a DVI to HDMI adaptor and hook up the pc to the TV with an HDMI cable.
My pc is an old Pentium 4c unit, an HP A350N, into which I had fitted a Radeon 1650 Pro video card.
I was unable to get any picture on the TV with the pc hooked up, no matter what resolution I tried, nor which of the four HDMI inputs I hooked the pc up to.
I was able to use the S-Video output of the 1650 to get a picture on the TV, using the S-Video input, but the picture was awful - really fuzzy, and unusable.
I decided to install a new video card, with an HDMI output on it. The card is a bit of an oddity, since it uses an AGP interface, but I figured it would give me better graphics performance than the old 1650.
After installing the card and Catalyst Control Center and drivers, and checking that everything was working with a 22" LCD monitor connected by DVI cable, I tried the pc hooked up to the HDTV with an HDMI cable.
Upon starting to boot up, the TV showed a 1920 x 1080 60Hz image (that information showed at the top of the TV screen) - but just for the 256 colour bios and initial phase of XP booting up. At the point where the blue XP welcome screen appears, the HDTV screen went blank.
I tried hooking the pc up to a relative's Vizio 42" HDTV - and there were no problems whatsoever! I could get a full 1920 x 1080 picture, using a refresh rate of 60Hz. Initially, I noticed that the screen picture had a black border around it, about 1" or so wide. When I checked in the Catalyst Control Center, it seems that there is a default underscan setting of about 7%. When I reset that to 0%, the picture filled the HDTV screen, with no border.
At that point, I thought I was onto something - perhaps the Philips HDTV couldn't cope with that default underscan, so I thought there was a chance that it would now work with the underscan set to 0%.
Unfortunately, it was not to be.
I next tried uninstalling all of the display drivers. When I booted up the pc, with the Philips HDTV connected, I got a picture, and Windows XP booted up successfully. But the image was only 1024 x 768, scaled to fill the whole TV screen.
After XP had booted up, it detected new hardware - a VGA controller, and prompted for installing software. When I allow it to install the software (HD4650 drivers) and then go into display settings to change the display resolution to any of the resolutions listed in the Philips HDTV manual, I lose the picture, and return to a situation where I get a picture on the TV only for the initial phase of the pc boot up.
It seems like no matter what I do, the Philips TV will not work with the plug and play display drivers, or any of the AMD drivers.
Can anybody help me sort this out? Upon calling Philips support, they simply state that there's no guarantee of the TV working with all pc's, and that it's a pc problem not a problem with their TV.
From this experience, I can only deduce that Philips TV's have far worse pc connectivity than other TV's - and that's ironic, since I specifically chose this TV to work as a display for my pc.