If in warranty, let them fix it.
The first time I boot up, my notebook (compaq presario 2500) freezes, and I have to restart at the blue scrolly thing screen. The second time I boot up, the Safe Mode, Safe Mode With Networking, Last Good Settings, and Normal Start screen shows up. I choose Normal Start and the computer boots up super slow (I remember way faster times). I run Spybot, Adaware, Norton, Housecall, and some others, but none of them have found anything serious.