|"Board: ASUSTeK Computer INC. CROSSHAIR II FORMULA 1.XX"|
Your mboard (abbreviation for motherboard) / main chipset has a video adapter built into the mboard = onboard video, and the mboard has three PCI-E X16 slots that you can install up to three video CARDS in.
NVIDIA GeForce 7900 GT/GTO [Display adapter]
NVIDIA nForce 980a/780a SLI [Display adapter]"
You have two display (video) adapters, but only ONE video (graphics) CARD.
A video CARD is a video adapter on a physical printed circuit board that you can install in a mboard slot, and is removable.
Your onboard video is a video adapter but it's NOT a video CARD !
"ASUSTeK Computer INC. CROSSHAIR II FORMULA 1.XX"
Crosshair II Formula (Asus home support page)
Specs - Excerpts..
Chipset: NVIDIA nForce®780a SLI™ Chipset
Multi VGA output support: DVI & D-Sub
3-Way SLI Bridge
Your "NVIDIA nForce®780a SLI™ Chipset" supports.....
- two or three NVidia video adapters running in SLI mode, in Vista or Windows 7 ONLY.
- Hybrid video - the onboard video working along with a video adapter that's been installed in a PCI-E X16 slot on the mboard, in Vista or Windows 7 ONLY, RATHER THAN than the onboard video being automatically disabled when you install a video card in a PCI-E X16 slot which is the usual case for most main chipsets. that have onboard video.
HOWEVER, the video chipset on the video card installed in a PCI-E X16 slot must be compatible with the main chipset's support for Hybrid video.
Your "NVIDIA GeForce 7900 GT/GTO [Display adapter]" is NOT one of the NVidia video chipsets that is compatible with that feature.
I'm assuming that you are plugging the computer monitor, or input on the TV, into video ports on the " NVIDIA GeForce 7900 GT/GTO [Display adapter]" - on the video CARD in a slot space further down on the back of your case
I haven't had any experience with Nvidia's Hybrid video feature, but I HAVE had experience with AMD's Hybrid video feature, on two different Asus mboards that have a main chipset that supports Hybrid video, that had a video card installed in a PCI-E X16 slot.that had a video chipset that WAS NOT supported by that Hybrid video feature.
- with default mboard bios settings, the video CARD in the mboard slot produced NO VIDEO while booting.
- I found the video ports for the onboard video were STILL PRODUCING VIDEO.
In order to get the video CARD in the mboard PCI-E X16 slot to produce video while booting, I had to change either two or one default setting(s) in the mboard's bios Setup
- to DISABLE the onboard video
- to make sure the Primary video or similar was set to a PCI-E X16 slot,
, then Save bios settings
You will probably find, when the 7900 video CARD is installed in a slot, if you connect a monitor or your TV's input to a port for the onboard video, it IS still producing video, and you DO get video from it while booting BEFORE Windows loads.
(DO NOT plug in or unplug a monitor or the TV into / from a VGA or DVI port while the computer is running !)
Then you need to go into the bios and probably change one or more settings.
I downloaded the manual for your mboard and looked at it.
This is probably what you need to do....
In your mboard's bios Setup...
Onboard Device Configuration
Hybrid SLI mode
Hybrid Support - MUST be set to DISABLED
Onboard GPU - MUST be set to Auto
Primary Display Adapter - MUST be set to PCI-E
Save bios settings.
Shut off the computer.
Move the monitor's or TV's connection to a port on the video CARD installed in a slot space on the back of the case.
Start up the computer.
You probably WILL have video while booting BEFORE Windows loads.
- If you use a HDMI connection, we HAVE see some instances where someone who started a subject here got NO VIDEO while booting BEFORE Windows loads, yet a VGA or DVI connection works fine. We have no idea why that is.
- you will get no video from the onboard video ports after changing those settings If you want to use the onboard video again, you will need to either
- change settings in the bios when the monitor is connected to a video CARD
- or - remove the Cmos battery, install it again,
or move the Clear Cmos jumper on the mboard to the Clear position, move it back to the "normal" position
...to set the bios settings back to defaults, and you will need to set the current Time and Date in the bios, Save bios settings.
HDMI has the same video output as a DVI video connection, but also has the wiring for audio integrated into the connection.
A DVI or VGA connection has no support for audio built into the connection. .
- for the TV, you have to also connect (a) cable(s) for audio to the TV's sound input(s) from your computer's audio adapter output port(s)
E.g. connect between an 1/8" stereo jack on both the sound adapter and TV, or between an 1/8*' stereo jack on the sound adapter to a pair of two mono RCA jacks , red and white, on the TV
- or - you connect amplified speakers meant for computers to the proper sound adapter ports on your computer (you will probably hear nothing from un-amplifiied speakers).
(NOTE - the front line out - headphones - stereo port on a desktop case may NOT work - that requires that you have connected the wiring from that port to a header on the mbord properly, and you MAY also need to change a default setting in the bios for the type of sound - AC '97 or HD - depending on which type the case wiring supports.
To avoid that possibility, plug into (a) audio output port(s) on the BACK of the case.)
Windows allows you to have more than one sound adapter installed on the computer, but only one of them can be used at any one time.
Also, Windows can only output sound one way at a time.
If you get no sound when you're using a VGA or DVI connection when you connect your audio adapter's output port(s) to the RIGHT audio input port(s) on the TV that go along with the video input port, or when you connect the sound adapter to amplified speakers, then you probably need to change the audio output source from HDMI to something else in the settings for your sound adapter in Windows.
Sound settings in Vista or Windows 7....
See Response 6 in this
" Make sure you don't have volumes set too low or muted, for things you want to hear or use.... "
Note that the sound is Muted if the blue speaker icon has a red circle icon with a diagonal bar.
On my computer that has MCE 2005 / Vista Home Premium on it, the mboard's onboard video has a HDMI port, but I am not using it at present.
In Vista, in Sound - Playback settings, I have a listing for "Digital Output Device (HDMI)" but it is NOT the default device.
The default device has the green circle with a white checmark on it - in my case that's beside Speakers.
I suspect your HDMI output is the default in your Playback settings.
When you're using a VGA or DVI connection, that must be set to something else.
To change which sound source is the default, RIGHT click on something else that is not the default, e.g. you probably need to select Speakers in your case, and select Set as Default or similar.