No Audio thru HDMI from 9800GT/DG45ID - help!

OK I am having major issues and can find no way of testing or verifying what is wrong with my new PC
Everything works great except for sound over HDMI. If someone can help me I'd be very grateful!

I have a brand new PC with Gainward 9800GT card (with HDMI output, via mobo spdif header wire connection) running with an Intel DG45ID mobo with WinXP SP3. Mobo runs IDT HD udio codecs. Vid Card has no audio settings I can find anywhere.

I have got a lovely 1080p picture via HDMI on my Phillips Cineos 47" LCD TV (HDMI 1.3 compliant) via the 9800gt's HDMI output. No matter what settings I have found and played with, and with multiple reboots etc, I cannot get a peep of sound from the TV via the PC's HDMI link. I don't have any other HDMI devices to test on the TV's inputs, or any other means of testing the computer's digital optical audio outputs. I have checked the wiring on the mobo to video card and all looks in order. I have updated all drivers. I have even flashed the TV's firmware to current.

Can anyone suggest a way of determining what is wrong? I am getting good anologue audio from the PC, i can send some program's sound output to SPDIF (anologue cuts out) but stull nothing from the HDMI output via spdif mobo passthrough. I can't find anything that specifically mentions "HDMI" on any drivers or audio settings, for that matter either, only SPDIF.

What am I missing?

I do not want to have a long run of analogue audio running seperatly to the TV to get my sound. I want to use the PC/TV link to play recorded HDTV (have a leadtech HDTV capture card) via HDMI only.

The only thing I can think of trying is ripping out the 9800GT and seeing if the mobo's HDMI is outputting sound....

Hi, Yes the graphics hard is HDMI similar to yours (not DVI), with the two pins from the motherboard to the card. (I have checked the wiring, it appears to go from the correct pins, the VCC pin is not connected). The BIOS has SPDIF enabled. I'll have to check if there's a high-def option that is not turned on.

Out of interest, if you have a similar motherboard - in the IDT Audio panel, or device manager/control panel I don't have a HDMI Audio device to point the sound to. Do you? I have only got the IDT 1 and IDT 2 audio streams. HDMI does not get a mention anywhere.

I saw the thread # 1103611.html (can't post URL yet!)
but can't get the IDT HDMI device to install manually either... not sure what I am doing wrong.

Edit: Yes the "High Definition Audio Codec" is enabled in the BIOS. Every perephial is except IR device (haven't got one)

The IDT control panel on mine has the two toslink SPDIF outputs. I have not tried setting it to the front panel specifically (I can't see how, as it does not say there's anything connected?), but in the settings tab (2 gears logo) I have got spdif 'enabled'. And the res light around the rear toslink port glows red.

I will try a few more things tonight....

Hi, No I have not tried the mobo's inbuilt HDMI output as yet. I think that is the next thing I will try!


No, it came with the card, you can't plug the card's end in incorrectly (shaped plug), the other end is plugged in to the SPDIF (red) and Ground (black) pins on the mobo.


I can't choose between HD Audio OR SPDIF. I cant' see anywhere in the bios where it mentions spdif (maybe that is my problem?) I also don't have any sound settings that have any mention of HDMI. I have no TV audio settings to set!

Grrr! Removing the 9800GT video card - the onboard HDMI output works fine - after installing the Intel graphics drivers, which included a HDMI sound driver. All nice crisp sound blaring from mt TV, no handshaking issues or anything. There was a new option in the IDT Audio controls for HDMI, so I could choose between HDMI Audio, IDT Audio1 or IDT Audio2.

Now that I have put the 9800GT card back in, it is silent again. And the HDMI Audio device has disappeared from device manager. And I am sad, and back to square one, except I do know that the HDMI sound on my TV does actually work, as does the mobo HDMI port.

Has anyone ever got this card to make any noises????

Yup, Brand new drivers (release date 5th April '09)
I did have a HDMI button on mine, and the HDMI Audio Device - until I put the 9800GT back in.
I am on XP (32bit), and my IDT looks like this (I have not speakers connected at the mo, just HDMI and the 9800GT is present)



I am not sure how to disable whatever the iGPU as per the previous poster....

I'll have to check this.l.... after spending hours and hours trying different things, have taken whole box back to PC shop to see if htey can make it speak ;-)

OK People I can now confirm that it's an INTEL issue. This combo of DG45ID mobo, and 9800GT card won't work under XP - XP is not passing the audio correctly. Have had to install Vista and now it just 'works'!

Edit: It works - but not on my TV!

at appears that Philips LCDs and nvidia cards are not compatible. I cannot beleve I have managed to get a Home Theater computer, with nearly every component (TV, video card, version of windows and motherboard) being completely inoperable together.

Whateer you do do not run this combination:
DG45ID mobo with Win XP (onbard spdif no worky unless you get Vista)
9800GT card - (with no sound pass thru until upgraded to vista).
Win XP Pro no likes mobo
Philips LCDtv no likes nvidia cards
!!!!!!!!!!!! Lucky I havn't tried any fancy speakers yet as I am sure something won't work there either.