displayport issue - black screen

[lkenneth]

Hello everyone.

 

I would appreciate some help if possible please. 

 

I assembled a computer recently. When I plug my monitor using Displayport (on the motherboard), once it passes the BIOS page, the screen turns black (no signal). If I use the HDMI port on the motherboard instead, then there is no issue.

 

My build:

B450M MSI Mortar Max (Bios build 10/6/2020. The box says "AMD Ryzen 3000 desktop ready")

AMD Ryzen 5 3400G

Corsair 16GB (2x8GB) Vengeance LPX 3200MHz DDR4 RAM

SN550 NVMe SSD

1TB HDD

Antec NE500G-ZEN PSU (500W)

 

I have tried:

1. used different monitors

2. used a new DP-DP cable

3. used a DVI-DP cable (with adapter)

4. used a new DVI-DP cable (without adapter)

5. Unplugged the monitor cable and its power cable, waited for a few minute then replugged

6. ensuring the DP cable is fully plugged

7. asked someone to test the RAM. He said there's no RAM issues

8. Window 10 re-install

9. ensuring the BIOS and the IGPU drivers are the latest

 

Thanks!

[TrigrH]

tried plugging while the system is on?

[lkenneth]

3 hours ago, TrigrH said:

tried plugging while the system is on?

Yes I have tried plugging in both while the system is on and off. Nothing

[frozensun]

Hook up the monitor to other PC,and if everything works okay,then you know it's your MB video adapter dead...In that case your monitor is okay.

Piece of cake..

Do you get any message like "checking the signal"?

[lkenneth]

8 hours ago, frozensun said:

Hook up the monitor to other PC,and if everything works okay,then you know it's your MB video adapter dead...In that case your monitor is okay.

Piece of cake..

Do you get any message like "checking the signal"?

 

The other monitor works well on another computer that uses DP-DVI cable (with adapter). Also, I have tried different monitors with my own new PC and they all failed. Yes so I think it's my PC's issue, but I am wondering where is the problem.

 

I actually took the PC to the shop that I assembled the computer before. The shop owner said they have tested the computers for 2 days,but could not find out the issue. Then they took the MB to the distributor, the distributor came back and said the MB works on their end by using a lower ended CPU (I think it is what the shop owner told me, but I cannot say this with 100% confidence). But the thing is my PC build is not that unconventional either -  it's just B450M + 3400G, with the newest BIOS.

 

I don't get message like "checking the signal". It's just black screen. 

 

Oh wait, I should have mentioned the monitor (when only plugging one monitor to the DP on MB) would normally black screen. BUT, if I then plug in a window media creation USB and boot into that USB, then the window re-installation page would start. Now, there are 2 scenarios:

 

(A) If I carry out the window installation process, again with only 1 monitor plugged to the DP,  it will continue the installation but at some point of time during the installation, or shortly after the installation (i.e. when you had thought it finally works), it will turn black screen again and would continue to give black screens

 

(B) If I cancel the window installation process at the beginning, the computer would restart but then load to a blue page which it says 'Window does not load correctly'. Usually there are a few options that I can pick like system restore, self repair, uninstall window updates etc but they would all fail. Then in one instance I chose to restart the PC again and this time after booting it turned black screen. At this point I plugged in my another monitor to the MB HDMI slot, then everything is normal on that monitor with HDMI (i.e. I could see the actual desktop and navigate internet or open my personal files etc)