Well, I've asked a friend of mine and he has given me two interesting links:
This one shows that you're not the only one with that kind of problem:
Code:
http://www.mcse.ms/archive49-2004-7-516055.html
And in this one there's a firmware upgrade to solve a problem like that:
Code:
http://h18000.www1.hp.com/support/files/Notebooks/nl/download/10562.html
I hope it helps...