My old computor crashed, so I have taken the hard drive out and installed in external case and pluged into my other computor. So far I am not getting anything out of my external hard drive. Any ideas?
Try it in a different computer. If the external case has USB 2.0, try a different port. Check to see whether the HDD is spinning when power is applied.
If the HDD is ok, then check 'Device manager' in the Control Panel. It is possible that the old computer failed due to th hard disk failing. Check out these possibilities one by one.