# Raspberry pi 4 won't boot if there is no hdmi cable **URL:** \ **Category:** General Discussions\ **Tags:** warrior\ **Created:** [April 23, 2020, 8:25am UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820 "2020-04-23T08:25:47Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![ikkysleepy](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/ikkysleepy/32/156_2.png) [@ikkysleepy](https://hub.mender.io/u/ikkysleepy)\ **Post date:** [April 23, 2020, 8:25am UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/1 "2020-04-23T08:25:47Z")
I updated all repos and now my Raspberry pi 4 won’t boot up unless I plug in the HDMI cable. The lights turn solid red and Ethernet card is solid. I have to boot with the HDMI Cable on. I tried to disable the HDMI on boot but it didn’t seem to fix the issue. `hdmi_blanking=2` Not sure if it’s related to mender / rpi but I know the DISABLE\_VC4GRAPHICS has now been fixed in mender cause it to turn turn yellow and be all wacky. Mender is version 2.2 ---
**Author:** ![ikkysleepy](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/ikkysleepy/32/156_2.png) [@ikkysleepy](https://hub.mender.io/u/ikkysleepy)\ **Post date:** [April 23, 2020, 8:42am UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/2 "2020-04-23T08:42:57Z")
Quick update, so the following config makes the RPI4 boot up now: `hdmi_force_hotplug=1` and it looks like the > hdmi\_blanking=2 command isn’t working yet for RPI4. ---
**Author:** ![mirzak](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/mirzak/32/2056_2.png) [@mirzak](https://hub.mender.io/u/mirzak)\ **Post date:** [April 23, 2020, 1:51pm UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/3 "2020-04-23T13:51:24Z")
Are you using Yocto? Which branch in that case? ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [April 23, 2020, 2:54pm UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/4 "2020-04-23T14:54:13Z")
Yeah, that is indeed odd. Given the mention of VC4GRAPHICS I assume this is with Yocto. I’ve done recent testing on both 32- and 64- bit RpI 4 builds and they worked ok with both HDMI and the Pi Foundation Display. I have seen issues with cheap HDMI panels but the full size one I have worked fine. Drew ---
**Author:** ![ikkysleepy](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/ikkysleepy/32/156_2.png) [@ikkysleepy](https://hub.mender.io/u/ikkysleepy)\ **Post date:** [April 24, 2020, 12:14am UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/5 "2020-04-24T00:14:09Z")
Yes Yocto with Warrior branch. It was working fine in Feb, but I just updated the repos now and now I had that issue. ---
**Author:** ![drewmoseley](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/drewmoseley/32/47_2.png) [@drewmoseley](https://hub.mender.io/u/drewmoseley)\ **Post date:** [April 28, 2020, 2:45pm UTC](https://hub.mender.io/t/raspberry-pi-4-wont-boot-if-there-is-no-hdmi-cable/1820/6 "2020-04-28T14:45:45Z")
I just did a fresh build using the instructions from [here](https://hub.mender.io/t/raspberry-pi-4-model-b/889) and it booted. The only manual change I made was to add “enable\_uart=1” to the config.txt file. Do you have any other local changes in your build? Drew