AMD Motherboards - Fatal1ty B450 Gaming-ITX/ac HDMI & DP not working

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Fatal1ty B450 Gaming-ITX/ac HDMI & DP not working

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=16297
Printed Date: 18 Jul 2025 at 1:19am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Fatal1ty B450 Gaming-ITX/ac HDMI & DP not working

Posted By: mvitorino
Subject: Fatal1ty B450 Gaming-ITX/ac HDMI & DP not working
Date Posted: 20 Sep 2020 at 7:13pm

Hi,

Have an ITX Fatal1ty B450 with a 3400G (no dedicated GPU) that has been working fine for 9 months, but since yesterday both HDMI and Display Port stopped showing image.

Have tried:
- 4 x different HDMI cables
- 1 x single DP cable
- 3 hdmi ports on 1 x 75" LG TV (that has been its output for the last 5mo) | have confirmed TV ports are working with other devices
- 1 x 28" ASUS monitor, with both hdmi and DP cables (monitor ports also working with other devices)

No image during boot or after.
I get a black vnc session when no display attached. With a display attached, I can vnc fine and everything else appears to be working correctly (so it does appear to detect the presence of a display).

Display keeps switching every few seconds between a black screen and "no signal detected".

Any help would be appreciated?