Ubuntu does not booting! failed to start nvidia-powerd service

I have a PC with Nvidia RTX 4090, with 525 nvidia driver, and cuda v12, I decided to downgrade it to 11.8. After installing it and rebooting, the system does not boot, it gives me failed to start nvidia-powerd service and then a black screen appear. I dont want to reinstall my ubuntu since I dont want to lose data. What can I do to solve this problem please :(

The problem was solved by the following steps:

1- When the pc is booting (when you see the manufacturer’s logo), press and hold the Esc to interrupt the boot process and enter the GRUB menu.
2- Select “Advanced options for Ubuntu” from the GRUB menu
3- choose the Ubuntu, with Linux-generic (recovery mode)
4- Select → root Drop to root shell prompt

you can now remove or install packages. Next, I’ve done the following:

sudo apt-get remove --purge '^nvidia-.*'
sudo apt-get install ubuntu-desktop
sudo rm /etc/X11/xorg.conf
echo 'nouveau' | sudo tee -a /etc/modules
Sudo Reboot

Then you need to reinstall the NVIDIA driver and CUDA…

Thank you…

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