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Right click on desktop, go to 'graphics options' and then to 'output to'. Go to 'clone displays' and select 'monitor + built-in display'
It helps to have the TV plugged into the VGA port on your notebook before you turn that on.
You should have 2 video ports on the 8400 GS card. One is the standard 15 pin VGA port and the other is the DVI port. You should be able to use these ports on the card to connect dual monitors. If you use the video port integrated on the motherboard you will bypass the 8400 GS card. Here's a link from Microsoft about running dual displays: http://www.microsoft.com/athome/organization/twomonitors.aspx The other issue is whether your monitors are DVI compatible.
Go into control panel / sounds / sounds and audio / select audio blind / should see a driver listed in each device. Back to sounds blind /test sound, if you can see the black arrow but its greyed out then driver is faulty. If you can click on it and it changes baxk to th esquare all is OK, ensure the sound jack is plugged into the GREEN ones at rear PC. Also check in volume blind that speakers are selected.
Run microsoft update and make sure to select all updates (even optional). You will see hardware updates (if there is any) and this may fix the issue. Let me know if not.
Please try to check it from Control Panel > Sound, speech & audio devices > Sound and Audio Devices > Hardware tab > then select the Device Name then click Properties tab to verify its condition status or you opt to click Troubleshoot tab. regards
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