How to rejoin computer into domain

I had this question after viewing Cannot rejoin computer to domain when MS LAPS is used.

Hello Experts,

We have LAPS set up and now we are facing some issues.
Computers gives trust relationship error and after removing it from AD, we can not add them into domain again. We don't have password to login in Laptop with Administrator account.

How can I resolve it?
LVL 2
Nilesh KambleSr.System EngineerAsked:
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Shaun VermaakTechnical SpecialistCommented:
You can still lookup password using LAPS admin interface
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Nilesh KambleSr.System EngineerAuthor Commented:
Thanks for your comment but LAPS admin and also attribute does not show the password.
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Shaun VermaakTechnical SpecialistCommented:
Then perhaps it was never managed via LAPS. Reset password with password reset tool
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Nilesh KambleSr.System EngineerAuthor Commented:
My computer is out of domain and i am not able to login into computer because I don't know the password...how could resetting password will help me login into my computer.
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
Reset the local admin password I think is what Shaun was saying. http://pogostick.net/~pnh/ntpasswd/bootdisk.html
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Tom CieslikIT EngineerCommented:
There is a more than 10 options to reset local user /admin password

https://4sysops.com/archives/three-ways-to-reset-a-windows-vista-admin-password/
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Tom CieslikIT EngineerCommented:
You can also try this

Run Active Directory Users and computer on your DC
Navigate to your domain
Right click on Computers -> New -> Computer
Put you computer name (Remember that Pre-Windows 2000 field must have up to 8 characters without special characters)

Save

Restart computer and try log-on as Domain Admin

After that you can change membership and remove domain admin account from local computer
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Nilesh KambleSr.System EngineerAuthor Commented:
There were duplicate name created in AD and previous one lose secure channel and there were no password found in the GUI. So, decided to reformat the OS(it's not a solution yet). But for time being we have to do this.Thanks to all who put efforts to resolve this issue..

Thanks..
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