I am trying to upgrade my OS from Vista to 7 Ultimate. I can not access the bios boot sequence to allow me to change to dvd. It get's to the screen for me to hit f2 or f12 but freezes there. I figured the bios may need to be reset, so I removed the hard drive so it will force me to select a device to boot from and then I would select my 7 ultimate dvd...or so I thought. It starts the process and then interupts. so I jumped the b500 circuit and restarted the laptop to see if that would reset the bios...nothin. Please help. I have exhausted what I believe is all my efforts and knowledge. Thanks in advance.