F5F Stay Refreshed Hardware Desktop Question: Why isn't the computer starting unless the HDMI cable is removed?

Question: Why isn't the computer starting unless the HDMI cable is removed?

Question: Why isn't the computer starting unless the HDMI cable is removed?

Z
Zercuador
Member
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163
07-08-2016, 10:01 AM
#1
The 9 year old Nvidia graphics card has 2 cables connected to it. One DVI going to the monitor, and an HDMI cable going to an AV receiver/amplifier.
The computer was working fine for past 6 months, and this is recent.
Once I unplug the HDMI, I go ahead an plug it back in, after the computer POSTs.
I log on to Ubuntu 22.0 LTS, and it doesn't notice the HDMI interface at all.
There's no option to 'mirror' the display.
If I wish to have sound, I now have to resort to connect an optical cable from the motherboard to the AV receiver.
BIOS was already 'flashed', for the sake of being able to use an M.2 pci for booting to OS, as future upgrade, which I have yet to utilize.
System specification:
Intel 4670K Haswell
Asus Z87 Plus w/UEFI compatibility
Nvidia GeForce 760
G.Skill Low Cas Latency 4x32GB
Sandisk SSD
Edit: I unplugged the DVI and then plugged the HDMI directly to the monitor, then change mode on the monitor from DVI to HDMI, and computer is able to boot.
Also, I unplugged the AV from the electrical power outlet with DVI plugged in, and the computer refused to post. I then unplugged the HDMI cable from the AV and computer was able to post.
I guess the next step would be to go an AV forum and make my way up from there.
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Z
Zercuador
07-08-2016, 10:01 AM #1

The 9 year old Nvidia graphics card has 2 cables connected to it. One DVI going to the monitor, and an HDMI cable going to an AV receiver/amplifier.
The computer was working fine for past 6 months, and this is recent.
Once I unplug the HDMI, I go ahead an plug it back in, after the computer POSTs.
I log on to Ubuntu 22.0 LTS, and it doesn't notice the HDMI interface at all.
There's no option to 'mirror' the display.
If I wish to have sound, I now have to resort to connect an optical cable from the motherboard to the AV receiver.
BIOS was already 'flashed', for the sake of being able to use an M.2 pci for booting to OS, as future upgrade, which I have yet to utilize.
System specification:
Intel 4670K Haswell
Asus Z87 Plus w/UEFI compatibility
Nvidia GeForce 760
G.Skill Low Cas Latency 4x32GB
Sandisk SSD
Edit: I unplugged the DVI and then plugged the HDMI directly to the monitor, then change mode on the monitor from DVI to HDMI, and computer is able to boot.
Also, I unplugged the AV from the electrical power outlet with DVI plugged in, and the computer refused to post. I then unplugged the HDMI cable from the AV and computer was able to post.
I guess the next step would be to go an AV forum and make my way up from there.

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T
Ternaves
Junior Member
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27
07-12-2016, 12:58 AM
#2
Didn't include details about your PSU's brand, model, or age. It could be that your AV receiver is causing a grounding problem—check if the equipment is connected to a different power outlet.
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T
Ternaves
07-12-2016, 12:58 AM #2

Didn't include details about your PSU's brand, model, or age. It could be that your AV receiver is causing a grounding problem—check if the equipment is connected to a different power outlet.

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Y
YummyGummy_
Member
Find
166
07-12-2016, 04:20 AM
#3
It appears the issue with Ubuntu not recognizing the HDMI port after POST was linked to the Secure Boot configuration in the UEFI-Bios, as shown in the diagram. I had to switch from Windows to 'Other OS'. The display still works properly. It’s still necessary to unplug and reinsert the HDMI cable after POST. The PSU I purchased used in 2022 cost $40 with shipping. A Thermaltake 80 Plus 500w model was bought. Also, if the HDMI remains connected but the computer won’t POST, I can disconnect it, plug it back in, and then press both the monitor and power buttons—then Ubuntu login appears. If I disconnect before turning on the PC, I don’t need to press the monitor’s power button at all.

I resolved it by enabling CSM; it showed four new options. For Ubuntu, only UEFI is needed for boot device control. The second and third options were ignored, while the fourth option set to boot from PCI-E/PCI expansion device was configured as UEFI drive.
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Y
YummyGummy_
07-12-2016, 04:20 AM #3

It appears the issue with Ubuntu not recognizing the HDMI port after POST was linked to the Secure Boot configuration in the UEFI-Bios, as shown in the diagram. I had to switch from Windows to 'Other OS'. The display still works properly. It’s still necessary to unplug and reinsert the HDMI cable after POST. The PSU I purchased used in 2022 cost $40 with shipping. A Thermaltake 80 Plus 500w model was bought. Also, if the HDMI remains connected but the computer won’t POST, I can disconnect it, plug it back in, and then press both the monitor and power buttons—then Ubuntu login appears. If I disconnect before turning on the PC, I don’t need to press the monitor’s power button at all.

I resolved it by enabling CSM; it showed four new options. For Ubuntu, only UEFI is needed for boot device control. The second and third options were ignored, while the fourth option set to boot from PCI-E/PCI expansion device was configured as UEFI drive.

Reply
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