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#11
Go to Sony Support and find out which key enters the bios, there might be more key options when booting to boot from a boot disc or USB drive, or check hardware.
When the computer is starting up, the keyboard is controlled by the bios as the OS has not started up yet. If the keyboard won't let you access the bios, you have a hardware problem.
If you can enter the bios, set the DVD drive to boot first, or whatever F key Sony uses for boot options and then boot using your W7 disc.