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Often your computer may fail to boot from the hard drive due to logical system corruption or hard disk failure. Commonly you may want to boot from other data media (such a CD or floppy disk) in order to perform some system rescue. To boot up from a different bootup media, you just need to configure your BIOS to change the boot sequence.
The boot sequence is a functionality located in most of the modern pc BIOS that tells your computer the sequence of devices to look for as the booting device (must have the necessary operating system) each time you power up your computer.
To do this, follow these steps:
Also please refer this link::
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