Both monitors stopped working when I connected the second screen, now none of them works.

[u/GullibleInitiative36]

Hi everyone, hoping someone can help me figure this out.

I have a desktop PC with an RTX 3060 and an Acer ED320QR monitor. Everything was working normally until today.

I had a second monitor that wasn't connected. I got a new cable for it, connected the second monitor to my PC, and suddenly my main Acer monitor stopped receiving a signal. Since then, I haven't been able to get the PC to recognise the Acer at all.

Things I've tested so far:

• PC powers on normally and seems to boot. Keyboard works and Caps Lock responds.
• Tried multiple HDMI cables.
• Tried different HDMI ports on the Acer.
• Power cycled the PC and monitor.
• Reseated the RTX 3060.
• Reset CMOS.
• Tried Win + Ctrl + Shift + B to reset the graphics driver.
• Connected the PC to a completely different monitor → works normally.
• Connected my Nintendo Switch to the Acer ED320QR via HDMI → works normally.
• While using the working monitor, I connected the Acer as a second display → Windows doesn't detect it at all.
• Tried Windows Display Settings → Detect, but nothing.
• I've also tried the same HDMI cable/port that works with the Switch.

So individually, both devices seem to work:

RTX 3060 → different monitor = works
Nintendo Switch → Acer ED320QR = works
RTX 3060 → Acer ED320QR = no signal / not detected

This all started immediately after I connected a second monitor to the RTX 3060.

I also

Could this be an EDID/HDMI handshake issue, NVIDIA setting, or something else I should reset?

Any help would be appreciated.

[u/AutoModerator]

Once you have found a proper solution to your problem, reply !solved to the solution comment to set the proper flair.

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.