|If you can get into the bios Setup no problem, then NONE of the settings in it are "locked" - you can change the Boot Order or similar settings if you need to. |
If you CANNOT get into the bios Setup because you must type a password to access it and you don't know the password and never did, or have forgotten it, usually you can STILL change which device the computer boots from. For most laptops, you see a line while booting "Press (a key) to change boot device" or similar. If you see such a line while booting, if you press the stated key while that line is being displayed, you can choose any device listed to boot the computer from.
If such a line is NOT displayed while booting, see the User's or Owner's manual for the model - there usually IS a key you can press while booting to select a device to boot from, in any case.
"Have you looked at the bottom of the BIOS screen to see what keyboard..." KEYS "....are actually used ?"
Usually a mouse DOES NOT work in the bios Setup screens.
If you set your Boot Order or similar settings a certain way, then usually you don't need to change them no matter what you're trying to boot the computer from.
Also - reasons why your hard drive may not be detected as bootable by the bios.
See Response 1:
If your laptop has a SATA hard drive....
Installing XP and SATA drive controllers, SATA drives; the SATA drive controller bios settings.
See response 2: