jonrogersuk
Posts: 6
Joined: Thu Jan 26, 2012 11:30 am

Won't boot without HDMI connected (solved)

Sun Jul 15, 2012 2:31 pm

I've been using my RaspberryPi headless, connected to a USB hard disk and the network from the cupboard where my router lives. It was running for 21 days like that, no problems, then I re-started it. Now, bizarrely, it will only boot when I take it into the living room and connect it up to the TV with HDMI. I have tried all the available power supplies, so I don't think it's that, and simply un-plugging the HDMI cable is enough to stop the RPi from booting.
When I plug in power, the red light comes on, then the green OK light flickers for a couple of seconds. If the HDMI is not connected, that's all it will do. Network lights don't come on, I can't get anything to tell me what's happened. With HDMI, the network lights come on after a tiny pause and the green OK light keeps doing its thing.
I have tried different SD images, no good. I have tried booting with nothing connected, no good.
What can I do? It's not practical to keep the RPi where it is currently working - any suggestions? :

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5372
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Won't boot without HDMI connected

Sun Jul 15, 2012 2:51 pm

Have you tried rpi-update. There has been a fix for a problem just like this.

jonrogersuk
Posts: 6
Joined: Thu Jan 26, 2012 11:30 am

Re: Won't boot without HDMI connected

Sun Jul 15, 2012 8:01 pm

Amazing! Thanks, that was exactly what I needed - you deserve a medal! And if that was post number 1337 for you, even better!

Mark
Posts: 7
Joined: Sun Nov 20, 2011 4:05 pm

Re: Won't boot without HDMI connected (solved)

Tue Jul 31, 2012 10:51 pm

I am having the exact same problem on a Pi I just received. I've run rpi-update but the problem persists.

As with the OP, everything works fine if I boot with HDMI connected. I'm using the latest Raspbian, updated, if that matters.

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5372
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Won't boot without HDMI connected (solved)

Tue Jul 31, 2012 11:07 pm

@Mark
You could try:
boot_delay=1
or
hdmi_force_hotplug=1
in config.txt.

Mark
Posts: 7
Joined: Sun Nov 20, 2011 4:05 pm

Re: Won't boot without HDMI connected (solved)

Tue Jul 31, 2012 11:47 pm

hdmi_force_hotplug=1 seems to resolve it. Thanks!

KenT
Posts: 758
Joined: Tue Jan 24, 2012 9:30 am
Location: Hertfordshire, UK
Contact: Website

Re: Won't boot without HDMI connected (solved)

Wed Aug 01, 2012 4:52 pm

There are a number of people with this problem. Is there any downside to configuring the software release to hdmi_safe being on, or at least hdmi_forcehotplug?

Once people have got their system going they can always change to unsafer options.
Pi Presents - A toolkit to produce multi-media interactive display applications for museums, visitor centres, and more
Download from http://pipresents.wordpress.com

dom
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 5372
Joined: Wed Aug 17, 2011 7:41 pm
Location: Cambridge

Re: Won't boot without HDMI connected (solved)

Wed Aug 01, 2012 5:00 pm

KenT wrote:There are a number of people with this problem. Is there any downside to configuring the software release to hdmi_safe being on, or at least hdmi_forcehotplug?

Once people have got their system going they can always change to unsafer options.
hdmi_force_hotplug forces hdmi output. Someone with a composite TV will get nothing.

User avatar
wymand
Posts: 47
Joined: Thu Nov 28, 2013 2:06 am
Location: relocating to hiddenridge
Contact: Website Facebook Google+

Re: Won't boot without HDMI connected (solved)

Sat Nov 05, 2016 5:53 pm

I also had the no boot without HDMI problem and tried all the fixes listed to no avail. Then I noticed in rasp-config advance options I had enabled the GL driver. Once the GL driver was disabled, the pi boots fine without HDMI
Never stop learning
Never stop evolving

Return to “Troubleshooting”