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Monitor not recognizing my pc (rog strix z790e)

ichiks
Level 7

hi

I recently built a gaming pc, but my monitor is not recognizing that the pc is turned on using DisplayPort. I did some research and tried the following:

  • BIOS update
  • Clear CMOS
  • Swapped RAMs
  • Securing cable connections 
  • Making sure DP is connected to GPU, not motherboard
  • Trying HDMI
  • Different monitor

None of these seemed to work, so I took it to a pc shop and the next day he concluded that BIOS is corrupt and motherboard itself is broken. He tries using different RAMs, but didn’t work. Fortunately, I was able to replace it with a new motherboard after negotiating with the store that I purchased it from. I tested the motherboard before installing to see if the monitor recognizes, and it did. I reinstalled it into the chassis and the monitor is not recognizing it again.. Does anybody have the same issue with this Rog STRIX Z790-e gaming wifi motherboard? I don’t think the store will allow me to return it again since it was already past the due date at the first attempt but they were generous. This also proves that the first motherboard was probably not physically broken, but rather it is a comparability issue. These are all the parts I’m using:

  • i7 13700K
  • G.SKILL Trident Z5 RGB Series (Intel XMP 3.0) DDR5 RAM 32GB (2x16GB) 6400MT/s CL32-39-39-102 1.40V
  • SAMSUNG 980 PRO SSD 2TB PCIe NVMe Gen 4 Gaming M.2
  • GIGABYTE - NVIDIA GeForce RTX 4070 Ti Gaming OC 12GB GDDR6X PCI Express 4.0
  • NZXT AIO and fans 
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1 ACCEPTED SOLUTION

Accepted Solutions

Jiaszzz_ROG
Customer Service Agent

Hello, @ichiks 

Based on your description, could you check if the issue persists when cross-testing with an HDMI connection or does the problem only occur with a DP connection?
If possible, try cross-testing with different monitors, cables, connection ports and GPU.
When there is no display upon booting, are there any Q-LED indicator lights on the motherboard?
If so, please refer to the steps outlined in [Motherboard] ASUS motherboard troubleshooting via Q-LED indicators.
Meanwhile, we suggest you refer to [Motherboard] Troubleshooting - No Power/No Boot/No Display and test with minimal components to isolate the possible cause.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂

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2 REPLIES 2

Jiaszzz_ROG
Customer Service Agent

Hello, @ichiks 

Based on your description, could you check if the issue persists when cross-testing with an HDMI connection or does the problem only occur with a DP connection?
If possible, try cross-testing with different monitors, cables, connection ports and GPU.
When there is no display upon booting, are there any Q-LED indicator lights on the motherboard?
If so, please refer to the steps outlined in [Motherboard] ASUS motherboard troubleshooting via Q-LED indicators.
Meanwhile, we suggest you refer to [Motherboard] Troubleshooting - No Power/No Boot/No Display and test with minimal components to isolate the possible cause.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂

Hi Jiaszzz_Rog

I appreciate your response. It’s working fine now. I did exactly what you told me by plugging in only the minimum components to the motherboard: CPU and power supply to the motherboard. Then I started installing GPU, SSD, AIO, 2.0 USB headers, etc. I was able to isolate the issue with one of the 2.0 USB header that was connected to the NZXT fan controller (6 rbg and 3 fan ports) that was preventing the PC to boot up successfully to the BIOS screen, always showing the Q-Code 77 with red CPU light. I also see a steady white light on the fan controller. So I change the way fans and AIO are connected in a more simplified way which finally let the PC boot up successfully.

The minor issue that I have now is that in the BIOS page, there is only CPU and AIO fans are showing status as correctly functioning along, and the rest are showing “N/A” (the fan symbols not spinning). It’s also showing as so in the NZXT RGB fan controlling app that I downloaded. It could be the steady white light on the fan controller itself as mentioned previously, but I don’t know what it means. The actual fans and lights are working just fine with all the lights synchronizing with others, so I’m just ignoring it.

Overall, the PC is working just fine (downloaded windows 11 and drivers), and I’m afraid of messing with the 2.0 USB headers again which might cause the same issue, so I’ll just not do anything with it unless there is a solution.