If you mean that you set a password in BIOS, you have two options. You will need to remember it, or have Dell help you. Dell can help, but you would have to prove that you are the legitimate owner and, as it is out of warranty, you would have to pay for the assistance. Here is more information from Dell about BIOS passwords, and here is how to contact Dell Support.
Good night, i have a inspiron 5577, i recently had some security problems so i needed to set a password in my HD in case of the worst scenario, the problem is, i set an Admin password and the HD (system) password but i can only remember my system password, i can use my computer but i want to format it and i probably will not be able to do it without my admin password, do you guys have any ideia of what can i do?
Admin password