Legacy system Graphics card not sending signal

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Componentgirl90

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Jan 9, 2015
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I have just switched on my legacy system for the first time and it does not output an image to the monitor when connecting to the graphics card. An image is displayed if the monitor is connected to the VGA port on the motherboard.

I am using a D-SUB cable to connect the D-SUB port on the monitor to a D-SUB to DVI adapter which is plugged in to the DVI port on the Gfx card. Any ideas?

My specs are:

Gigabyte GA-G41M-ES2L
http://www.gigabyte.com/products/product-page.aspx?pid=3500#ov

BFG Geforce 7800 GTX OC
http://hothardware.com/reviews/bfg-geforce-7800-gtx-oc

Monitor
http://aoc-europe.com/en/products/i2369vm
 
Solution
Chicano
The larger black object with 15 fins about 1" x 1.5"? it's a heatsink for the chip under it.. Without the spring to keep it in place the chip may be overheating but I doubt it's overheating so quickly it doesn't allow at least a few seconds of video. You could hold it firmly in place while you push the Power button and see if you get video. If that's causing the issue, it should display video as long as you press on it and at least a few seconds (but probably more) after you release it.

According to the description here both DVI ports are DVI-I (fully compatible with D-Sub/VGA) and you shouldn't be having trouble getting display, at least from the motherboard logo up to right before Windows starts loading. I'd suggest...
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Chicano

Chicano

Judicious
Aug 29, 2011
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What Windows version do you have on that computer?.. If it's Windows XP, and it previously connected through D-Sub/VGA to the monitor, it's probably configured to use the D-Sub/VGA port on the motherboard... The motherboard only has D-Sub/VGA video and the PCIe Card only has DVI-I video... Windows Vista, 7 or 8 would make the switch automatically... so, it's very likely I'm guessing correctly. If so, the solution may be as simple as configuring the Wndows Display settings to use the PCIe video card.



 
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Chicano

Chicano

Judicious
Aug 29, 2011
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You said:
An image is displayed if the monitor is connected to the VGA port on the motherboard
Click to expand...
So, that's what you have to do to have display and start making the necessary changes to boot the computer, that may depends on which Windows version is installed, so I'd have to know to provide the next suggestions.

If the PSU were the problem, it would not give image/video at all.
 
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
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That's right but as far as I can tell, you only have display through D-Sub/VGA and not through DVI.. That may indicate
a) Depending on the BIOS, that it can't change automatically from D-Sub/VGA to DVI,
b) Or that the Video card is not working...

In older BIOS (and also depending on which) you had to change the Video/Display setting (D-Sub/VGA to DVI and viceversa) manually.. your's only gives display with D-Sub/VGA so you have two possibilities, either the BIOS doesn't change automatically or your PCIe Video card is not working. Then if you manage to get display through the PCIe Card and have Windows XP installed, and if XP was set to D-Sub/VGA it will not have display until you configure it manually.
 
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Componentgirl90

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Jan 9, 2015
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Thank you for this info. I looked in the bios and the option is set that the onboard VGA will disable if there is a card in the PCI express slot (enable if there isn't a card). So I assume this may likely mean that the card isn't detected as the onboard VGA is enabled.

I will try and reseat the card.
 
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
29
35,490
The larger black object with 15 fins about 1" x 1.5"? it's a heatsink for the chip under it.. Without the spring to keep it in place the chip may be overheating but I doubt it's overheating so quickly it doesn't allow at least a few seconds of video. You could hold it firmly in place while you push the Power button and see if you get video. If that's causing the issue, it should display video as long as you press on it and at least a few seconds (but probably more) after you release it.

According to the description here both DVI ports are DVI-I (fully compatible with D-Sub/VGA) and you shouldn't be having trouble getting display, at least from the motherboard logo up to right before Windows starts loading. I'd suggest if the BIOS has a setting where you can set DVI video only, (as opposite to changing automatically from VGA to DVI when sensing the PCIe card), use that setting to not depend on the BIOS changing automatically. And if possible, test the graphics card in another computer.

 
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Solution
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Componentgirl90

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Jan 9, 2015
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Yes that's the correct object.

I set init display first to PEG (PCI express). There is another option in the bios which basically has the option change VGA to DVI in the presence of a graphics card but there is no option for using the graphics card only. The only other option is use onboard only.

I'll probably skip holding it down as I am too chicken in case I get electrocuted or something.

I have ordered another card from ebay and I will see how that will ok. I will try another monitor once I can get a power lead as well.
 
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