I have facing some problem in booting time

/dev/sda2 : clean, 286851/14671872 files, 3501487/58664828 blocks

When my laptop turns on it shows on a black screen.

Is an informative message about the fsck performed at boot.
If the system hangs there, then you might have a GPU driver issue, but if continues to boot into the Desktop, then all is fine.

Want to disable fsck ?

  • Either edit your /etc/fstab file and change, at the end of the root aka / line, the 1 or 2 you have there to 0
    then save the file and reboot

  • Or remove fsck from /etc/mkinitcpio.conf on the HOOKS line and then run from terminal:
    sudo mkinitcpio -P
    sudo update-grub

Remember, if you do the above and something happens then you might have to run fsck manually …
https://wiki.archlinux.org/title/fsck
read also

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Thanks for helping me. Now error gone.

IS NOT an error. :wink:

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so what was it?

Disabling fsck is not recommended

The system utility fsck is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux, macOS, and FreeBSD.

I already pointed that out by giving the OP a link to read and learn, then make up their mind.

If I install new Manjaro OS, will it be correct?

Why are you doing this? Manjaro by default will have the fsck hook in the /etc/mkinitcpio.conf and that informative message will always be there because fsck is running at boot. There are other ways to hide that message but will depend and might not work on your system, so please read more about here Silent boot - ArchWiki

There is no need to reinstall.