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Question PC doesn't like 2nd video card

G

greymanic

Junior Member
I have a stock HP z420 with a old ATI HDTV card. After doing some compatibility research I bought a new Geforce 1650 OC. My PSU is 600 watt. I spent about 3 hours trying to get the monitor to run on it. I could get the BIOS screen but the picture would either freeze on the Windows 10 screen or simply put the monitor to sleep before reaching Windows. Thankfully it has 2 PCIe slots. I put the ATI card in its original slot and the new Geforce in the lower one. I booted to windows from the ATI card. I put the new Geforce card in the lower PCI slot. Using the device manager I confirmed the new card was listed and installed Geforce drivers, latest chipset and BIOS drivers. Device manager now recognized the Geforce card and I can plug the monitor into it and essentially get what I should.... The problem is I have to start the PC off of the old card (or I just have the same black screen) then switch the cord back to the working Geforce after it boots to Windows. I cannot take the old card out or even switch their positions on the PCIe's. Is there a way to get it to recognize the new card without the old one? Do I need to change the priority somehow? I've never seen this issue. I attached a pic of my PSU specs if that helps.
 

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HP BIOS whitelist? If it's not that, then maybe some secure boot / UEFI issues.

Try disabling Secure Boot and Fast Boot.

It could also be that only one of the PCI-E x16 (physical) slots supports a 75W card.
 
Last edited:
That is an old mobo, so probably some compatibility issues. Try and reset the cmos, and start again. Make sure you are using the right cable to the monitor.
 
Yes, I got the nividia to run by installing the drivers while running video from the old card. I can ditch the ATI card. I just need the geforce to run correctly without it. I will try the BIOS and cmos.
 
I changed the slot startup priority in BIOS and then it wouldn't start up on either card. I reset the CMOS and it now starts up with the nividia card. Other one's in the trash.
 
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