Dell Inspiron Mini 10V Bios Password Problem.

I have Dell Mini 10v, and I just removed password from the bios, and rebooted it. It still asks me the password, and my old password doesn't work. I called the Dell Customer Service, and they say it is $59.00 for just password. It is not reasonable price. I opened it and disconnected the battery, but it failed.

Please, help me.

my service tag has 7digit.

this is error code.

System Disabled 04700

Service tag <ADMIN NOTE: Service tag removed per privacy policy>

T.T; Please, help.