Sony Vaio VGC-RC300 Series User Manual page 139

What should I do if Windows does not start, showing the message "Operating system not
found," when I turn on my computer?
Make sure your computer does not have a "non-bootable" CD or DVD in the optical disc drive (if applicable).
If a non-bootable media is in the drive, follow these steps:
1 Remove the media.
2 Restart your computer and confirm that the Microsoft Windows operating system starts properly.
If the Windows operating system still does not start, follow these steps to initialize the BIOS:
1 If there is a CD or DVD in the optical disc drive, remove it.
2 Turn off your computer.
3 Remove any peripheral devices connected to the computer.
4 Restart the computer.
5 Press the F2 key when the VAIO logo appears.
The BIOS setup screen appears.
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6 Press the key to select the Exit menu.
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7 Press the key to select Load Optimal Defaults.
8 Press the Enter key.
The Load Defaults? window appears.
9 Press the Y key on the keyboard.
10 Select Exit Saving Changes and press the Enter key.
The Exit Saving Changes? window appears.
11 Press the Y key on the keyboard.
Your computer restarts.
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Troubleshooting