Jetson TK1 unable to return to graphical interface

I have a Jetson TK1 board. It was normal at first.When I installed Caffe on an online tutorial, I press ctrl+alt+F1 into tty and typed the following command:sudo service lightdm stop .(Before that I installed the NVIDIA graphics driver).Since then, the graphical interface can not come out any more.When I press ctrl+alt+F7 or F8, the screen is black, only the cursor blinks in the upper left corner.
I hope I can get Chinese support if possible.


Please restart the TK1 and check if this issue remains.


Black screen after reboot, press Ctrl+alt+F1 can enter tty1.

Which release is this? Most recent is R21.6. See:

head -n 1 /etc/nv_tegra_release

Is any error shown via:

sha1sum -c /etc/nv_tegra_release

If this is all ok, what is the output from:

sudo -s
cat `find /sys -name edid`

Is this purely an HDMI cable, or are there adapters in the line?

1.# R21 (release), revision: 3.0, GCID: 5091063, BOARD: ardbeg, EATE: Tue Feb 3 02:03:23 UIC 2015
2. -bash: shalsum: command not found :find /sys -name edid: No such file or directory

I’m looking for a Chinese company that can help repair or brush machines.


Sorry for the missing.
You don’t need to install GPU driver for Jetson manually. It’s combined in Jetson OS system.

Please remove the NVIDIA driver you installed or reflash the device with JetPack.

Btw, the “sha1sum” is with number “1”, not lower case letter “L” (the name refers to the SHA-1 hash function). This is to tell if the drivers are valid for that release.

R21.3 is quite old and had some bugs which might be relevant to loss of video.

This is of concern: :find /sys -name edid: No such file or directory

If this cannot find an edid file, then drivers are probably not installed correctly (quite possibly the sha1sum command would show failure of

sudo -s
find /sys -name edid