dell OptiPlex 780 No video output when GPU installed.

[LightningsalesUK]

I am trying to create a Hackintosh with a Dell OptiPlex however it seems whenever I install the GPU there will be no video output from the GPU or the onboard Video however when I take out the GPU the onboard outputs like normal.
I am using a HD5450 as the GPU.
I have updated the BIOS and enabled some features which make the system automatically select the GPU as the main video output when is plugged in but still the same issue.
I have also tried with another GPU and had no success.

 

[william p]

You need to create a System Restore point in System Tools (or whatever Mac uses) then in Safe Mode (F8) or equivalent remove the old GPU drivers.
Then do a clean GPU install in Safe Mode. The drivers may need Windows etc. to actually install, but it should boot into Safe Mode.

 

[LightningsalesUK]

You need to create a System Restore point in System Tools (or whatever Mac uses) then in Safe Mode (F8) or equivalent remove the old GPU drivers.
Then do a clean GPU install in Safe Mode. The drivers may need Windows etc. to actually install, but it should boot into Safe Mode.

Thanks for the reply, I am yet to get the OS installed as I would prefer a GPU so Windows 10 is still installed.
So F8 should boot the system in safe mode and I should remove any GPU drivers on the Windows OS?

 

[Calvin7]

HD5450 requires 400 watt power supply.

OptiPlex 780 probably has about half of that.

 

[william p]

HD5450 has a TDP of 19W. The PSU will be just fine.
https://www.techpowerup.com/gpu-specs/radeon-hd-5450.c503
The video resolution for Safe Mode is the default resolution for all video cards. It will run with no drivers installed. The System restore point is to recover the old drivers if this doesn't solve the problemfor some reason.

 

[LightningsalesUK]

HD5450 has a TDP of 19W. The PSU will be just fine.
https://www.techpowerup.com/gpu-specs/radeon-hd-5450.c503
The video resolution for Safe Mode is the default resolution for all video cards. It will run with no drivers installed. The System restore point is to recover the old drivers if this doesn't solve the problemfor some reason.

I still am having no luck with any cards I put in the system. It just seems to turn on to an unstable state. When powering it on with the GPU only a quick press of the power button will shut down the system which makes me think the system has not even booted past the bios state?

 

[william p]

Are there any Diagnostic LEDS lit up on the front? Dell has a pretty thorough capability there.
https://www.dell.com/support/home/us/en/04/product-support/product/optiplex-780/manuals
It may be that the PSU, or MB is dead. Trash in the GPU slot?
I think there's an option in BIOS for PCI video. Did you enable that?

 

[LightningsalesUK]

Are there any Diagnostic LEDS lit up on the front? Dell has a pretty thorough capability there.
https://www.dell.com/support/home/us/en/04/product-support/product/optiplex-780/manuals
It may be that the PSU, or MB is dead. Trash in the GPU slot?
I think there's an option in BIOS for PCI video. Did you enable that?

No light codes or issues at all.
The system works perfectly with everything apart from when a GPU is added, I have tried other PCI cards and have had it boot fine. it just seems to be GPU's.
I have also gone through the BIOS several times to make sure that everything is enabled and as it should be.

 

[william p]

IDK. I've had good luck with the Safe Mode answer many times. It might be time to resort to parts swapping.

 

[LightningsalesUK]

IDK. I've had good luck with the Safe Mode answer many times. It might be time to resort to parts swapping.

Purchased another HD5450 which worked fine. Seemed like both GPU's have issues.