Her Mi laptop is hp and i can do nothing, when i turn on the laptop all that apeear is ENTER PASSWORD IN A Blue box. Please help me.

which many, the full partnumber answers that.
see on the service tag. we can not guess PCs ever.
what OS< windows, what windows.
have kids played with this PC?
post a photo of screen, we cant guess screens.
if you never get to the windows login screen , most times
this means some one turned on the BIOS Password.
ask how to cure that at HP , we are not HP. they have back doors
to get there, on mini's

here is real HP< we are not. that we be chat box non official.

the real DEAL 100% Real.
https://h30434.www3.hp.com/

If you would like to remove this BIOS password by yourself, you need to see this kind of video:
http://www.youtube.com/watch?v=SxGviSv7EoA

its a power on password set in the bios look online for a free bios password remover

Did you try to just click the ENTER key? without trying any fancy passwords.
Sometimes that's all you need
please let us know if it isn't.

It seems that a bios password keeps you locked out. Try entering the bios (del or F2 during the boot) and get back to defaults or reset the password.

Stelios.

you forgotton the password. I would boot it to safe mood and change the password under the control panel.

Flush the BIOS

that happened to my hp....some kid came to my house and stayed for the weekend...i don't know what the heck he did but i have a blue box as well and the password happens to be "password"....i don't know how i figured it out either...try it...it could work for yours as well!!! I would like to know how to get rid of it

What you have done is put a BIOS password on your system, all you have to do is enter the password you typed after you hit F10 the first time when the system boots up. if the password does not work try hitting the caps lock key and entering the password again.