What can I do if my computer asks for a password before booting and I don't know it?

I have a toshoba satellite that is my sons.  I recently replaced the hard drive and now it is asking me for a password upon startup.. There is a black screen with a blue box asking for a password.  I have seen videos on how to remove but none of them apply to my model.  Any help would be aprpreciated.
Model-L755-S5306

If it's a power-on password set in the BIOS of the laptop, there's no way to remove it without professional servicing. If it's a hard drive password, the hard drive would need to be replaced. I'm sorry.
- Peter

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