Solved. you need to modify grub by replacing the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash " with
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.si_support=0
radeon.si_support=1" in /etc/default/grub update grub with sudo update-
grub and reboot, in order to disable amdgpu, which, the new version
installed by linux 7.0.0, creates the compatibility issue, and enable
redeon

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https://bugs.launchpad.net/bugs/2161229

Title:
  Subject: Kernel regression: Black screen (display power off) with
  series 7.0.0 on HP ProDesk 600 G2 MT (AMD Radeon R7)

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