new gpu wont display

[truejaz]

Hello friends, I recently decided to upgrade my GPU and purchased the powercolor rx 5700 xt red devil To replace the old RX 480.
I plugged in the new card and turned on the computer. The computer worked and even went into Windows I heard the "Welcome to Windows" sound, But without display at any BOOT stage... By the way it looks the card itself works when you turn on the computer the fans and lights of the GPU work 
The monitor is connected with a DP cable And I tried every DP Connection on the card and there is no display 

Things I've tried to do so far (That did not help )
1.Complete deletion of video card drivers and softwareׁׁ(Used amd cleanup utility )
2.I updated the motherboard BIOS to the latest version 
3.I screamed into a pillow

HARDWERE 
ROG STRIX X370-F GAMING
G.SKILL FLAREX DDR4 2400Hz 8x2
ryzen 7 1700
rx 480 8g 
evga 750 gq

Operating System 
windows 7 ultimate SP1
And I'm not sure if it matters but my monitor is a gigabyte m27q

I would greatly appreciate any advice and help that would help me fix the problem before the 10th

 

Update: I reconnected the card and again did not get a display I disconnected the DP cable and connected an HDMI cable and it works!!!! I have a display now I just need to understand why the DP does not work

 

Update 2: After the drivers have been updated the DP connection works. I guess that's all that was needed to plug in the card in HDMI and install drivers and update them and that's it

Thanks so much to everyone for the help

[Helpful Tech Witch]

do you still have the old card? You could try new driver install with that and the 5700xt in the system, monitor on 480. Or just using win 10. Because win 7 is out of support. And 10isnt that bad. 

[truejaz]

7 minutes ago, HelpfulTechWizard said:

do you still have the old card? You could try new driver install with that and the 5700xt in the system, monitor on 480. Or just using win 10. Because win 7 is out of support. And 10isnt that bad. 

I'm not convinced the problem is with Windows because the card does not display anything including the BOOT process of the motherboard

[Helpful Tech Witch]

Just now, truejaz said:

I'm not convinced the problem is with Windows because the card does not display anything including the BOOT process of the motherboard

then bios update, then see if the problems continues.

[truejaz]

5 minutes ago, HelpfulTechWizard said:

then bios update, then see if the problems continues.

I have already updated to the latest version

[Helpful Tech Witch]

16 minutes ago, truejaz said:

I have already updated to the latest version

do you have a family member's pc or a second pc to try it in?

[truejaz]

6 minutes ago, HelpfulTechWizard said:

do you have a family member's pc or a second pc to try it in?

I do not have another computer with a strong enough power supply but I will try to check with my neighbor tomorrow morning (it's midnight right now)

[truejaz]

Update: I reconnected the card and again did not get a display I disconnected the DP cable and connected an HDMI cable and it works!!!! I have a display now I just need to understand why the DP does not work

[DoctorNick]

After installing the GPU driver again. Don't DP work? 2) Have you tried another cable? 3) Is the card bought 2nd hand? If yes, then the bios might have been modified on the GPU. Your GPU comes with dual bios, maybe try switching to the other bios. (remember to power PC off)

[truejaz]

Update 2: After the drivers have been updated the DP connection works. I guess that's all that was needed to plug in the card in HDMI and install drivers and update them and that's it

Thanks so much to everyone for the help

[truejaz]

27 minutes ago, DoctorNick said:

After installing the GPU driver again. Don't DP work? 2) Have you tried another cable? 3) Is the card bought 2nd hand? If yes, then the bios might have been modified on the GPU. Your GPU comes with dual bios, maybe try switching to the other bios. (remember to power PC off)

Updating the drivers when the card is connected in HDMI solved the problem. The card is new from the store

Thanks