XPS 8700, Yeston RX 550 4G D5 LP, no display

Thanks Ron. This is a windows 10 machine. The power button is not blinking any error codes. On the Dell xps 8700 it is always amber. Both monitors are connected to the new card, one dvi and one hdmi. They were connected to the old card this way and I did not change the cables. 

There has been an additional development. I read that I needed to disable secure boot in the bios. I did that and the card worked. Then I updated the AMD drivers. That got to the point that it rebooted the computer and then the card went back to the same behavior as before. That is, the computer appears to be booting but no picture on either monitor. I tried using the AMD utility to remove the drivers. That did not change anything.

When I put my Nvidia card back in both monitors function normally.

Thank you for your time. I hope this was enough additional info.

Need more info...

What version of Windows?

What color is power button on front of PC, and steady or blinking, when there's no video output? If blinking, count the blinks which is an error code.

How many monitors and where are they connected?

Are you connecting them to the add-in video card, not to either the onboard Intel Graphics HDMI or DisplayPort ports? Onboard video ports are #18 an #19. An add-in video card is in area #21.

Since you have the add-in card, the first monitor must be connected directly to that add-in card. If you want to connect a second monitor to one of the onboard Intel Graphics ports, you have to enable the Intel Multi-Display option in BIOS setup before you connect any monitor to an onboard Intel port.

Are your monitors set to automatically detect the type of video signal coming from the PC? Some monitors have to be set manually on their own On-Screen Display (OSD) to use the right input signal.

This PC model comes with a 460 Watt PSU. What size PSU is recommended for that video card?

Also, a 400W power supply is recommended for that card. 

Yes, I've see those Yeston cards. Who are they? Maybe they should be called NOton ?

Could be power, but if your Nvidia card is about the same wattage, maybe not. Some Dell-OEM power-supplies deliver good amps on the 12v rail for video-cards (so they work fine, but barely).

Not many video-cards come with Legacy-BIOS <> UEFI dip-switch any more. Most are UEFI only. If your machine is Legacy-BIOS or older/initial EFI (not fully uEFI), you are going to have problems.

For Nvidia GPU-based cards, MSI is good . eVGA is a second (lower) choice. If you go eVGA, be sure your card comes with lifetime warranty.

For AMD GPU-based cards, (it been a while) but I always had good luck with XFX cards. They all still work except for one (was in my brother's old XPS), and they replaced that one with a newer/better model.

Thanks for the info. My bios is full uEFI. I am thinking maybe you are on to something with the amperage on the 12v rail.

What is your xps 8700 bios version?  One community user had no post when trying to run RX570 in 8700.  The solution was

”You'll never guess it. Secure boot enabled. Clean startup.

The main issue that needed resolving was bios update to A01 to A14.”

RX550 and 570 are in the same class.  That user said “The PSU is 460W”.  RX570 is more powerful than your 550, so psu power is not issue here.

Thank you for that. My bios version is A08. Maybe an update will help. Interestingly, the card worked momentarily when I disabled secure boot and it was only after attempting to install updated drivers that is quit working again. I wonder if something about driver installation made it revert back to needing secure boot enabled. I'll try that real quick and then consider flashing the bios. I am putting the card in a friend's computer that has a card with same chipset running to make sure the card isn't bricked. We'll see what happens. 

RESOLUTION:

Thanks to all. A combination of all advice here led to a resolution. What I did was enable multi display in the bios and plugged one display in the onboard adapter so I could see what was going on with the AMD driver install. I still had secure boot disabled so was getting a 207 error on the AMD card in device manager. I switched the bios back to secure boot, rebooted, and boom, all is working. I am now color profiling and all appears to be working well. 

Thanks everyone!!

Glad you got it sorted!

But here's a dumb question...Are both monitors connected to the video card, now that's working. Or does one monitor still have to be connected to an onboard Intel Graphics port?

Re: re-enable secure boot.

this is a good case in point that secure boot off is counter intuitive in some Dell pc.  you actually need to enable secure boot in order for some gpu to pass POST.

Real Baile Yeston AMD Radeon RX550's are Legit. 

Yeston

Unfortunately there may be counterfeits.

Yeston RX550 B0953673BB

Its a 50W TDP card so even a 290W power supply is likely fine for this card.

Yeston Website

Yeston contact Info

@redxps630 

Re: re-enable secure boot.

this is a good case in point that secure boot off is counter intuitive in some Dell pc.  you actually need to enable secure boot in order for some gpu to pass POST.

That statement is false.

@BERN66 

NON OEM Dell GPU's need secure boot OFF to post.

This is the case for AMD, NVIDIA, etc.

When installing an after-market graphics card into a certified Windows 8 PC with UEFI enabled, the system may not boot.
https://nvidia.custhelp.com/app/answers/detail/a_id/3156/