I need password system bios

I am going to expand on @dinoo_fixit's answer as they missed key details. When you get the master password, it's case sensitive. On the D series and early E series machines you enter it and press Shift+Enter, then it will get you in. The key here is on Core 2 era E series machines it just gets you past the initial prompt - you need to make it permanent as if you were setting a new one. The trick is you need to go into the security menu, put the master password in the administrator password box and leave the other boxes blank - this will clear it out. Once you do that, save the changes and exit the BIOS.