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New Graphics Card, No Signal to Monitor, but PC IS booting to Win8.1

Last response: in Graphics & Displays
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April 5, 2014 7:21:48 PM

Alright, so.. I've built more than a few PCs over the years, and I have a lot of experience installing and replacing components, but I do not in any way consider myself an expert. That being said, I can usually figure out what is wrong when I get an error. This time, I am at a complete loss for what to do.

I bought my son a good but simple PC last fall. Brand new HP Pavilion Slimline 400-034. It has Win 8.1 and fairly good stats for being cheap. For Christmas, he wanted a Graphics card because we both game. So I got him one, and realized I needed a bigger power supply. In the end, I transferred the whole machine to a standard size MicroATX case with a Corsair CX500W power supply to support a GeForce GT 630.

Migration to the bigger case went fine and the PC works great, but now that I've tried to put in the card, I'm having a problem.

When the monitor is plugged into the Integrated DVI, the display is fine. Works well. But when I installed the card, plugged it in and turned it on, I get "No Signal to Monitor", but I can hear it boot and I can hear it log in to Windows. If I plug it back in to the integrated DVI, nothing happens. Still a black screen, unless I shut down, remove the card and then replug it in.

I do not know what to do. I can't install drivers without the card being in(It won't let me.) I can't find any way to porce the display to go to PCI-E. I am at a loss. Please help me fix this for my son.
a b U Graphics card
April 5, 2014 8:26:10 PM

It could be something as simple (or complicated since we are dealing with HP) as a bios update. It could also be a bad card.

Try either using a known good card in this system or using this systems GPU in a known working system and see what happens.

If you use a known working GPU and this system still doesn't boot, then it could be an issue with the PCIE slot, sometimes these low end systems do not allow for the full 75W of power a GPU will need from the PCIE slot.

If this GT630 works in a different system then it is either a power issue or a compatibility issue. Neither of which would be a surprise with it being an HP.
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April 5, 2014 9:15:06 PM

ish416 said:
It could be something as simple (or complicated since we are dealing with HP) as a bios update. It could also be a bad card.

Try either using a known good card in this system or using this systems GPU in a known working system and see what happens.

If you use a known working GPU and this system still doesn't boot, then it could be an issue with the PCIE slot, sometimes these low end systems do not allow for the full 75W of power a GPU will need from the PCIE slot.

If this GT630 works in a different system then it is either a power issue or a compatibility issue. Neither of which would be a surprise with it being an HP.


I don't think it's a bad card, because I had a different one I originally bought and it did the same thing. I'm reading online that other people using this Motherboard from HP have had success using cards, so I'm really not sure what else to think. I'd really like to avoid buying an entirely new Motherboard if at all possible.
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Best solution

April 6, 2014 7:56:03 AM

Update and Solved

So after 3 hours of internet searching in any kind of combination of terms I could think of, I finally stumbled on a discussion with a situation nearly identical to my own.

Apparently, the UEFI Bios used on this Motherboard with Windows 8/8.1 has a Secure Boot setting that is not compatible with a large number of Graphics cards. So I turned it off and turned on Legacy Boot, Shut down, Re-Installed the card, and booted back up and now it's running fine.
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