25 votes
Accepted

NOOBS stuck at rainbow screen - Raspberry Pi 4

I connected it to the other HDMI port and the image appeared, it was actually booting but showing the rainbow through that port.
Sebastian Braga's user avatar
16 votes
Accepted

Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

I've made this answer to summarize the experience to this issue. We are talking about Raspberry Pi 3 Model B+, released on 2018-03-14. It has some new and updated features compared to Raspberry Pi 3 ...
Ingo's user avatar
  • 42k
15 votes
Accepted

Boot from USB with a Raspberry Pi 4B that apparently has a broken SD card reader

It is certainly possible to avoid using the SD card for boot - none of my Pi devices use the unreliable SD card interface and all boot either from the network or an SSD via the USB port. Boot order ...
Greenonline's user avatar
  • 2,730
14 votes

Strange problem on startup - cannot open access to console

Found myself in the same situation just now. Took quite some time to figure out (taking into account that I had neither a USB keyboard nor a Linux computer around this was a long quest). The reason ...
KT.'s user avatar
  • 241
14 votes
Accepted

Ubuntu server on RPI 4 boot hangs on cloud init

I had the exact same issue on a P3 - tried different ISOs but no joy I was able to fix by disabling cloud init via ssh. 1) get the IP address of the Pi - I was at home so just logged onto my router ...
enricosuarve's user avatar
10 votes

isc-dhcp-server needs to be restarted after reboot

The reason why the ISC DHCPv4 server service fails is that at the time it is started the network interface configuration might not have been finished. As systemd cannot know when a service really has ...
TheDiveO's user avatar
  • 1,581
6 votes
Accepted

How to disable OpenVPN from running at startup on Raspbian?

If you are using jessie, check: systemctl list-units | grep vpn You should be able to find the name of the service this way (wild guess: openvpn), then: sudo systemctl disable openvpn That won't ...
goldilocks's user avatar
  • 58.7k
6 votes

Raspberry Pi 1 Model B+ end of life?

The rainbow square is an under-voltage warning. You might consider upgrading to a more powerful power supply (more amps, not more volts). EDIT To further answer your question I have tried to ...
88weighed's user avatar
  • 905
6 votes
Accepted

How to reboot my Raspberry Pi after wrong edition of my fstab?

Since I found the solution myself, I am posting it here, very grateful to every author of the raspberry pi forum posts. 1. Part 1 - getting command line in the boot Error Got "Cannot open access to ...
JMax's user avatar
  • 181
6 votes

Booting Alpine linux on Raspberry Pi 4

You can get the Raspberry Pi 4 to boot with Alpine Linux 3.10.2 by adding the following two files into the FAT32 (boot) partition: start4.elf and fixup4.dat. They can be obtained from the official ...
simplus's user avatar
  • 61
6 votes

Powering Raspberry Pi via battery pack and buck converter - how to solve low voltage reboot issues

You've not explained or shown how you have your batteries arranged, nor provided any specs on them. But it seems likely they are in series - thereby providing ~ 9V output. Batteries in series can ...
Seamus's user avatar
  • 21.7k
5 votes
Accepted

Recover pi 2 from wrong kernel build?

All the boot files are on a FAT32 sector, which is readable and writeable by all common operating systems. You can place the SD card in an SD card reader, delete the bad kernel, and rename the good ...
joan's user avatar
  • 70.9k
5 votes

Window IoT Core stuck while booting on Raspberry Pi 3

I had this problem too, it never got past that boot screen. It turned out it was a power supply problem. Pi 3 requires 2 A, and I had a 1.5 A micro USB adapter. When I switched to a 2 A adapter it ...
Johreg's user avatar
  • 51
5 votes
Accepted

Ext4-FS error on Raspberry Pi randomly

The filesystem appears to be getting corrupted repeatedly, and from the sounds of things, that includes while the system is running and not just between boots, which is when it is most likely to occur ...
goldilocks's user avatar
  • 58.7k
5 votes
Accepted

Is it possible to use partition UUID for root-parameter in cmdline.txt?

It seems with the current bootloader it's not possible to use partition UUID as kernel boot parameter for the root device. As suggested in the comment I tried booting with the device name /dev/...
Ingo's user avatar
  • 42k
5 votes

Windows 10 Iot Core Will Not Boot

Updated: Overtime a lot changes have been happened, this means the Original Answer might now works for newer images. There fore the work around is Download and install Windows 10 IoT Core Dashboard ...
Maytham Fahmi's user avatar
5 votes

Green LED blinking 7 times with rainbow colour image on screen

According to R-Pi Troubleshooting with 7 flashes of the green led the kernel.img is not found. I do not have any experience with android things but in general the Raspberry Pi boot loader expects its ...
Ingo's user avatar
  • 42k
5 votes

Raspberry Pi 3b+ not booting

Read it again: The Boot Problems Sticky it covers 99.999% of reasons your RPi won't boot. Then download plain Raspbian and https://etcher.io and use Etcher to rewrite your SDCard. It's highly likely ...
Dougie's user avatar
  • 5,271
5 votes
Accepted

RPi won't boot after editing fstab

If you want to edit files on the root partition, an easy way is to download some Linux distribution (Ubuntu for example) flash it to an USB stick and boot from it. Here is a tutorial how to do it. ...
jake's user avatar
  • 1,347
5 votes

No activity LED after shorting a GPIO to ground : dead or fixable?

I don't see that connecting pin 40 (GPIO21, aux SPI SCLK) to ground would have any bad effect. Most GPIO are set as inputs. Connecting an input mode GPIO to ground or 3V3 is normal operation and has ...
joan's user avatar
  • 70.9k
5 votes

One volume does a *full* fsck every boot, even though it's clean

I found what I believe was the cause, and it now appears to be fixed. Since this machine has a battery-backed RTC on it, fake-hwclock had been uninstalled long ago. When looking at the dump from '...
Gary Dobbins's user avatar
5 votes

NOOBS stuck at rainbow screen - Raspberry Pi 4

Try plugin your display to the other port. I spent an hour to figure out that my display was not on the primary display port and the secondary port was showing rainbow. Switched my display to primary ...
Shobhit Deep's user avatar
4 votes
Accepted

Cant login to rasberrypi

Assuming you are running Raspbian. The username is pi and the password is raspberry.
Steve Robillard's user avatar
4 votes

Unable to boot with RPi2 from a USB stick

The Raspberry Pi 3 will be able to boot from PXE, although this is not yet available. The references to USB boot were a misinterpretation of the writeup in the MagPi. The Raspberry Pi 2 can do ...
Milliways's user avatar
  • 59.5k
4 votes
Accepted

How can I install the KUMAN 3.5 inch-display?

Here are the drivers and the description of how to install the screen given by Kumantech. I got it working, and touch screen functionality also worked. I actually did this with combination with other ...
HelpNeeder's user avatar
4 votes

How can I install the KUMAN 3.5 inch-display?

Download the driver from here. Add to /boot/config.txt file the following lines: max_usb_current=1 hdmi_group=2 hdmi_mode=87 hdmi_cvt 800 480 60 6 0 0 0 Uncompress, move inside theLCD-show folder ...
jet's user avatar
  • 379
4 votes
Accepted

Raspberry Pi stops booting up

Failed or incomplete upgrade is one of those rare cases where you may render Linux unbootable. This usually happens when several related packages (like kernel and kernel modules) are being upgraded, ...
Dmitry Grigoryev's user avatar
4 votes

Unable to configure a Raspberry Pi Zero as a USB Mass Storage Device using g_mass_storage

All of your sequences work fine for me on macOS. However, on Windows 10 it would show up with the correct amount of space but "Unallocated". For whatever reason, this fixes itself and a drive letter ...
jdonald's user avatar
  • 2,904
4 votes
Accepted

Why won't my raspberryPi boot if I use parted to adjust the partition?

To summarize the comment section: we don't know why parted changes the disk identity, but can only guess (or rather speculate). Anyway, this change made by parted has the undesired side effect that ...
TheDiveO's user avatar
  • 1,581
4 votes

Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

/boot/bcm2710-rpi-3-b-plus.dtb is missing in older Raspbian images. Just run sudo rpi-update on your booted previous Raspberry Pi to fetch the missing firmware. After that you can switch to your ...
cma's user avatar
  • 51

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