Sony VGN-T140P VAIO User Manual page 143

What do I do if the message "Operating system not found" appears when my computer starts, and why
won't Windows start?
 Make sure the computer does not have a "non-bootable" floppy disk in the floppy disk drive (if applicable).
 If a non-bootable floppy disk is in the drive:
1. Remove the floppy disk.
2.
Restart the computer and confirm that the Microsoft

If the Windows operating system still does not start, follow these steps to initialize the BIOS:
1.
If there is a disk in the floppy disk drive, then remove it.
2.
Turn off the computer.
3.
Remove any peripheral devices connected to the computer.
4. Restart the computer.
5. Press the F2 key when the Sony logo appears. The BIOS Setup window appears.
6.
Press the Right Arrow key
7. Press the Down Arrow key
SETUP items. appears.
8. Press the Enter key. The Setup Confirmation window appears.
9. Select Yes, and press Enter.
10. Select Exit (Save Changes), and press Enter. The Setup Confirmation window appears.
11. Select Yes, and press Enter. The computer restarts.
Windows
®
to select the Exit menu.
to select Get Default Values. The message Load default values for all
operating system starts properly.
®
Page 143