Blank password in power on?

Laptop model Lenovo G58
i had power on password is 123
i tried to remove it from bios screen
it asked me to enter the old password
i wrote 123
then new password
i entered "" blank password
and i confirmed it "" blank password
and after restart its asked me again for password when i put 123 give wrong pass
when i leave it empty also give empty pass
what shall i do now?