[SOLVED] Changed some hardware, now not working: No Display, Not Detecting Peripherals

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LemonBubbles

New Member
Jun 4, 2025
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Hey, what's up everyone. I am brand new to Proxmox, so bear with me, but here's my issue:

I had successfully installed VE version 8.3 and had the WebGUI up and running, I hadn't set up a ZFS or unRAID yet, I was still trying to plan out my server. My main goal is to run Jellyfin and other self-hosted VM's/containers. The issue occurred when I realized that I'd require a GPU for transcoding and watching the media remotely. I had had LSI HBA card installed that connected to my 4x 8TB HDD's. It was working very well. Until, because my MoBo only has 1x PCIe lane, removed the LSI card, connected the HDD's to the MoBo via SATA, and installed a GPU. I attempted to SSH in via the IP and it wasn't working. I connected a monitor to my Proxmox host, using both the MoBo HDMI and GPU HDMI outputs; ineffective. I reverted the hardware back to how it was originally and it still won't work. I have connected a monitor to my Proxmox host and it still doesn't work. I have tried several HDMI cables with both hardware setups. The host won't detect USB peripherals either; I tried several mice and keyboards. I reset the CMOS / BIOS reset as well. Lastly, I have tried to reinstall Proxmox VE version 8.4 and am still having the same issues: the server turns on, but won't connect to a display, and the mouse/keyboard do not light up, so none of the USB ports on the Mobo work, either. I am out of troubleshooting steps and would really appreciate the help!

Hardware:

MoBo: ASRock Z790M-ITX WiFi

CPU: Intel Core i7-12700K

LSI Card: StorageTekPro Flashed Original LSI 9211-8i P20 (IT Mode)

Storage:

-4x HDD's: Seagate IronWolf Pro, 8 TB (ST8000NT001)

-1x WD_BLACK, 4TB SN850X NVMe Internal

RAM: G.SKILL Ripjaws S5 Series (Intel XMP 3.0) DDR5 RAM 64GB (2x32GB)

GPU: GeForce GTX 1660 Super

I would really appreciate the help or any suggestions, thanks for reading if nothing else!
 
UPDATE:

Tried to BIOS reset, both with the jumper pins, as well as removing the CMOS Battery; no dice. The host definitely boots, the case fans run, M.2 card LED works. and case LED's work, but still no connection to display or USB ports... I have no idea what to do now.
 
Hi,

Can you get into the BIOS settings menu or even see the "Splash screen" ?

Best regards
 
Last edited:
LemonBubbles said:
UPDATE:

Tried to BIOS reset, both with the jumper pins, as well as removing the CMOS Battery; no dice. The host definitely boots, the case fans run, M.2 card LED works. and case LED's work, but still no connection to display or USB ports... I have no idea what to do now.
Click to expand...
UPDATE:


The Mouse and keyboard LED's work now, but the display still won't connect; I have tried using 2 different HDMI cables in both the MoBo HDMI port and GPU HDMI port, as well as 2 different monitors.
 
I finally got the display to work! I just rebooted several times, and now it works. But now the ethernet isn't working, so I can't SSH haha. Out of the frying pan and into the fire! I was able to get into the BIOS and the MoBo-organic eth adapters are both enabled, the lights on the LAN port indicate "Data Activity" for the 'Activity/Link' light, and "100Mbps/1Gbps connection" for the 'Speed' light. However, once I save and exit the BIOS menu and let it boot, it boots to the pve login page and the LAN port lights turn off. I just need to figure out why the LAN port is shutting down after BIOS/POST, any ideas @JeanL?
 
It took several hours of scouring the Proxmox forums and Youtube, but I can finally SSH in. It turned out to be an issue with the labeling in the /etc/network/interfaces file. The system was looking for an enp2s0, and when I changed from the LSI HBA card to the GPU, the system must have labeled it to enp3s0. Took 2 seconds to fix, I just didn't know what I was looking for. I really appreciate the help, u/marc45ca, you're the man!


Since I am a beginner, and other beginners look for the same issue, it helps to know the commands (separated by semicolons): *ip a; cat /etc/network/interfaces; lspci; nano*

This thread also helped: https://forum.proxmox.com/threads/lan-interface-is-down-when-booting-proxmox-ve.129296/
 
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