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PC won't boot from CD
Some times you may want to boot from a CD or DVD rather than to your hard drive. This could be for a number of reasons, for example. One of the systems I use at home for testing the look of websites is Linux (another operating system). You can now download, free of charge, "Live CD's". These are operating system builds which can be run from CD/DVD.
If you are having problems booting from a CD/DVD, first make sure it is not the CD/DVD by trying one which you know works on another machine. Or try the one that doesn't work on another machine.
If you can't get any CD's to boot then it may be the boot order in the system bios. This is easy to change but you should do with caution as making changes to the bios can prevent your PC from booting.
As the machine boots up you should see an option to press a key to run the setup. This can be the "F8" key or the "Delete" key, you may find that you need to boot it up a few times before you see which key it is and get time to press it. Once in the bios go through the settings and find one which is something like "Boot order". Make sure the CD drive is before the hard Drive.