Hard drive doesn't work

HI, i have a problem I have a 40 gb hard drive which I uses as an external, but when I tried to make it as my master drive, it does not power on. Its not the mobo because I have a 4 gb hard drive as the previous master. What can I do? Please help.

You have to give us a lot more information. What are your computer specs? What operating system do you use? How is the external enclosure connected to the computer? Do you really mean a “4gb” hard drive? When you say “master” do you mean boot drive?

its a celeron 633, xp, yes its 4. something gb master boot