Finally, according to the HP support, the BIOS test result delivered that the hard drive is causing this problem. So, apparently it is a hardware issue. What kind of antivirus program do you recommend then, 2.0™? 2.0™: "Can't advise on the HP Security Suite other than to say that I uninstalled it. We have our own proprietary security. But when I did play with it that one time with my new Elitebook 2760P, I had to subsequently put a call into HP to reset my system back to factory in order to reset the system password. Never touched it since." Nah, this is not really an option considering the price tag for this accessory. I would be an absolute impudence, if this error persists as it was advertised as a solid security feature. I could then go for an apple product instead.