It all depends on what broke. If it is a physical problem, like, when you pick up the hard drive and you hear pieces rattle around inside, then you are basically SOL, you are not getting anything off unless you have a couple of grand and you are still rolling the dice. If the problem is that you are unable to boot off of the hard drive, then you may be in luck. You will need a few cables, to include power, to hook up the hard drive. If you can see the contents of the hard drive, then you are in luck. If you get a access denied, then either take it to a computer tech shop, or toss it.
Here is the item you will need from the Amazon web site:
Vantec CB-ISATAU2 SATA/IDE to USB 2.0 Adapter Supports 2.5-Inch, 3.5-Inch, 5.25-Inch Hard Disk Drives (Black)