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xp missing

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i have a toshiba sa40-151 laptop but after trying to restore using recovery discs i found that the optical drive was not working.After obtaining a replacement when i try to boot up i keep getting a message saying that the operating system is missing.Any help greatly appreciated.
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The laptop needs to boot from the CD-ROM drive in order to install XP from the recovery discs, but your system has not been set up to do that so it's still trying to boot from the hard disk on which the operating system has been damaged in some way.

You need to keep tapping a specific key on the keyboard as soon as you turn on the laptop. This will bring you into the 'BIOS Setup' screen where you can change the "First Boot Device" to CD-ROM.
The specific key you need to tap when you power-on varies by manufacturer, but you should see a message at the bottom of the screen when you turn on the laptop -- this will say something like "Press XX to enter setup", where XX will be the name of the actual key you need to press at that moment in time.

Edited by phillipcorcoran, 12 January 2010 - 05:45 AM.

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