Bych rekl, ze je problem mezi klavesnici a zidli...
Primo od zdroje:
http://h20000.www2.hp.com/bizsupport/TechSupport/D ocument.jsp?lang=cs&cc=cz&taskId=115&prodSeriesId= 96217&prodTypeId=321957&prodSeriesId=96217&objectI D=c00364979
Turn on or restart the computer.
While the display is blank, press the f10 key to enter the BIOS settings menu.
NOTE: The BIOS settings menu is accessible by pressing the f2 or the f6 key on some computers.