I have a Sony 300mhz with Windows 98. When I start my computer I get a blank black screen with the message in white text "Operating system not found". When I try the Restore CD, the first screen to appear is the screen with the Sony name. When this is finished, the second screen to appear is a blank white screen with a blinking black cursor. I tried pressing F3 when I was at the Sony screen, but still got the blank screen with blinking cursor. Any suggestions? Thank you for your help.