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DG45ID motherboard and Windows 7 HDMI audio problem ...
https://community.intel.com/t5/Intel-Desktop-Boards/DG45ID-motherboard-and-Windows-7-HDMI-audio-problem/td-p/266332
I have just upgraded my DG45ID multimedia computer to Windows 7. The system was working fine with Vista. I have upgraded the BIOS and downloaded all of the latest drivers from Intel, but this didn't help. I am not able to see a HDMI output like there was in Vista and I am presently without audio on my monitor.
Intel Desktop Board DG45ID Product Specifications
https://ark.intel.com/content/www/us/en/ark/products/34684/intel-desktop-board-dg45id.html
Intel® HD Audio Technology. Intel® High Definition Audio (Intel® HD Audio) is capable of playing back more channels at higher quality than previous integrated audio formats. In addition, Intel® HD Audio has the technology needed to support the latest and greatest audio content.
Intel® Desktop Board DG45ID
https://www.intel.com/content/dam/support/us/en/documents/boardsandkits/desktop-boards/P45_G45_Q45/DG45ID/DG45ID_TechProdSpec.pdf
June 2008 Order Number: E35960-001US The Intel® Desktop Board DG45ID may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are documented in the Intel Desktop Board DG45ID Specification Update.
Intel DG45ID HD audio - Loss of sound | AVForums
https://www.avforums.com/threads/intel-dg45id-hd-audio-loss-of-sound.1767839/
Looking at Intels support for this board there are several trouble shooting options to look at including a audio diagnostic wizard, this may help, but I am guessing that the on board audio has been disabled in the bios. Have put the link in below and hope that this may help you sort it out. Troubleshooting for the Intel® Desktop Board DG45ID. I.
Enable HDMI audio output on a Windows 10 computer - …
https://community.acer.com/en/kb/articles/12869-enable-hdmi-audio-output-on-a-windows-10-computer
Use the instructions below to select the HDMI source as the default audio device. Press the Windows () key + X at the same time. Select Control Panel. Click Hardware and Sound. Select Manage Audio Devices. Select your HDMI device and click Set Default. Click Ok to save your changes. The Sound should now play through the HDMI device you have ...
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