Computer does not recognize hard drive on startup

[igli]

My computer was running ok but i had to test a new hard driver that i got and it worked when i plug back my hard drive the computer said that there was no hard driver and give me a option to "Setup" by pressing F2 and so i did but then it asked me for the password which i don't remember setting up. Now without the password it wont let me change the settings. i had to install windows on the other hard drive that i was testing so i could get to this website for help because that hard drive has my life in it.

If Any one can help me please do

Thank you In advance

EDIT:
i also tried removing the battery but it didn't work.
i dont have a floppy drive.
I have desktop DELL dimensions B110

 

[Tedster]

reseat the hard drive.

Do not call it a "driver" that is something completely different. A driver is a program that tells a program how to use a device.

 

[Samstoned]

i

also tried removing the battery but it didn't work.

you couldn't remove the battery and what one
i

dont have a floppy drive.

what do you need that for
I

have desktop DELL dimensions B110

ask dell for password
remove the hard drive clean contacts then re-seat in connector
only hard driver I ever knew was the 16 year old blond who tried to run me over with her automobile

 

[luvhuffer]

If you didn'y set a password then at the password prompt just hit enter without putting anything in and see what happens. Did you reset the BIOS after you removed and reinstalled the battery?