|The passwords are case sensitive - they must be correct regarding whether the characters are upper case or lower case. |
Did you forget to try that ?
Can't remember which password?
If it's a system password you have to supply to access the laptop, before you get to Windows, or a hard drive access password, you can't erase it by installing Windows or the software that originally came with the computer. The laptop would have to be older than about ten years old in order for you to be able to find instructions for how to do that in the manufacturer's manuals.
Most HP laptops have a service manual available you can download from the HP web site. If it says you can't remove those passwords, the passwords are stored on a chip on the mboard that is not the bios chip, and it's data contents cannot be erased by removing the cmos battery inside the laptop. If it has a hard drive password, the password info or whether the drive is locked is stored both in that chip and on the hard drive in a data area that cannot be accessed by any normal method.
If you're the original legitimate owner of the laptop, if you contact HP and supply them with sufficient information they MIGHT supply you with a universal password, or they might not but MIGHT authourize a technician to do that for you.
Otherwise, you would have to buy a used mboard for your model that has no passwords enabled and replace yours. If the hard drive has a password, replacing the mboard will still not allow you to access the hard drive. Most techs simply replace the hard drive with a new one in that case.
If it's a User password you need to get into Windows, if you can access any user that has administrator rights, there are procedures you can do to remove or change the password for a user you can't access.
In most cases, there is no Adminstrator password for your Administrator user in XP or 2000 when you get the new brand name computer, and often no one has made one since.
Remove any bootable disks you have in drives.
Press F8 repeatedly, don't hold down the key, starting just after you boot the computer. Select Safe mode from the boot choices list that appears. A whole screen of lines for things that are loading will appear, then stay that way for a while, then a logon screen will appear. If you need no password to access the Adminstrator user, then you can use one of several methods to remove or change the password for a user you can't access because you forgot a password.
If you can't access any Windows user with administrator rights, there are ways of getting around that, but I would have to be supplied with enough info that this really is legitmately your computer from you to reveal them.