I have a Toshiba Satellite laptop which will not boot past the screen where the Toshiba logo is displayed. I have tried a different HD and other memory, no difference. I have the icons on the logo screen for varied boot source options (CD, HD, Network) but can not get them to highlight or do anything. Putting a bootable CD in the CD drive causes the CD drive to spin up, but no other change. Pressing Fn key lights the Fn light. Machine is clean and ran well, I'd like to fix it. Any ideas?