Won't boot from dvd or hard drive, changed hard drives and still won't boot
Depends on what you mean by won't boot from DVD or Hard Drive,
it sounds like your boot order is what you're looking for help for.
To do this you need to get into your computers BIOS (or "Setup")
You can do this by rebooting the computer and the very very very first screen you see tells you how,
usually by pressing DEL or F2 or F10.
Without knowing the specific computer you're looking for help on I can only point you in the right direction however keep in mind the BIOS is for advanced users only and you can damage your computer by randomly changing settings.
What you're looking for though is usually called the Boot Order or Boot Sequence
You'll need to set whatever device you want to boot from higher on the list (usually with the up arrow or PgUp)
If you don't see your device on the boot list then it may not be detected due to failure.
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