Ill read the manual since your not. QUOTE after turning on or rebooting the computer hit F10 when the curser is blinking then give the MATSER PASSWORD.
You may now proceede entering the...

Ok, Did you read the pdf or do you need adobe READER

http://www.adobe.com/products/acrobat/readstep2.html

Let BIG"B" sum this up, here is the manual (via)PDF
Source: HP...

Ctrl+Shift+F10.Try each combination (including none) of Ctrl, Alt and Shift with Del, Esc, F10, F2 and BkSp.

" Try f2 or delete. I recommend rebooting and as soon as the machine has power, tap...

Whats the brandname of that USB device? XLULUX