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4208
June 21st, 2020 18:00
Optiplex 780, 2408WFP, HDMI not working
When I connect my 2408WFPb to my Optiplex 780 via the HDMI ports and select HDMI on the monitor as DELL-Chris M said in this 2014 thread, it just goes into power saving mode and nothing else happens. The screen remains dark with nothing displayed in it.
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Mary G
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20.1K Posts
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June 22nd, 2020 14:00
Using a tv as a monitor is the only one that requires selecting the hdmi input. Computer monitors select it automatically if you have an hdmi port on the computer. I don't think you do on that old model.
https://www.google.com/search?q=hdmi+port&safe=active&rlz=1C1CHBD_enUS905US905&sxsrf=ALeKk00xp6ZpdUBSkIbWukXq-2UTLLQWkw:1592861646515&source=lnms&tbm=isch&sa=X&ved=2ahUKEwjxmPeEsJbqAhVLhuAKHXPDBsIQ_AUoAXoECBMQAw&biw=1536&bih=722#imgrc=5QQmhSwmRs6oaM
speedstep
11 Legend
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47K Posts
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June 22nd, 2020 14:00
There are no HDMI ports on a 780.
DVI to HDMI works but has no sound.
https://www.amazon.com/Rankie-Adapter-2-Pack-Gold-Plated-Converter/dp/B00ZMVGTA2
Models like the 780 do not support using ONBOARD video and another port.
HDMI requires Video card and DRIVERS as these are not built into windows.
If you try it will try to display the following message
System halted!
Attention: Unsupported Video Configuration Detected
Action is Required
This computer has an add-in graphics card, but the monitor is plugged
into the integrated video connector.
To attach the monitor cable to the add-in graphics card:
1. Shut down the computer
2. Plug the monitor cable into the add-in graphics card connector.
This may require a video adapter or video adapter cable.
(provided with the system)
3. Turn on the computer.
This message should not appear after completing these steps.
For more information or help, please refer to the system documentation
atarmiga2
1 Rookie
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9 Posts
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June 24th, 2020 03:00
Do you have a video card installed in the OptiPlex?
Obajimi752
2 Posts
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July 13th, 2020 11:00
yes I have a video card installed on the optiplex 780
speedstep
11 Legend
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47K Posts
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July 14th, 2020 01:00
Windows version as well a make and model of the card are not trivial. Stock power supply is for 25W cards. That limits the cards that actually work.
Full Size cards don't fit. Short cards fit and they MUST BE only 1 slot wide.The card must not be more than 40W unless you upgrade to EVGA 700BR or similar with an adapter due to non standard 24 pin connector which is the recommended minimum for a 780 mini tower. The 8800 GT Single Slot Card is the highest performance card that fits into the case. If you want to use real cards you have to buy a Precision T3500.
https://www.moddiy.com/products/Dell-980-960-780-760-PSU-24-Pin-to-Mini-24-Pin-Adapter-Cable-10cm.html
Many cards that would work are now legacy so the only driver that gets installed is the VGA driver which wont support HDMI.