When i turn my computer on it starts to load but then stops an goes to a black screen that says type system password then press enter but it will not let me type anything an wont even let me go into safe mode by pressing f8 and it wont let me go into the boot menu by pressing f12 either my computer is a dell optiplex780 . what do i do to fix this problem.???

The thing is, this Dell can be configured to have a bios password so it's not broken. Google up this.
Dell Optiplex 780 Documents.

In the manuals should be instructions on how to use your PC and how to reset this machine/bios password.

Nothing needs fixing. It only needs to be configured to your desires.

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