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Note, that system root password does not affect anything in Plesk by default.
In Plesk more important password of admin user.
Can you login to server via ssh connection as root? If yes, run command

# plesk repair installation

for fixing your Plesk. I hope it will help.
 
# plesk repair installation command run and finished without any problem and error but i've get The connection has timed out page in my firefox for http://{ipaddress}:8443/
 
Address should be https://{ipaddress}:8443
And check your firewall settings.
 
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