No really, why?
I moved a hard drive from one computer to another, faster computer, and in the process had to:

Change the modem, because the new motherboard didn’t like it
Remove the extra USB ports PCI card because it wasn’t liked either
Reinstall Windows because the old installation didn’t like the new chipset
Fiddle around with the Master / Master with Slave / Slave / Cable Select options on both hard drives because the old motherboard was OK with one configuration but the new one wasn’t as tolerant.

The Top Ten Design Bugs list has been going for several years now, and illustrates how user UNfriendly modern computer systems are:
http://www.asktog.com/Bughouse/10MostWantedDesignBugs.html
The list includes problems such as “If the computer loses power for more than a few thousandths of a second, it throws everything away” and “Designers offer no way for users to discover why a given menu or option has been dimmed (grayed out), nor how to turn it back on.”

Come on people, fix these damned problems already. Computers really should “just work”. I should be able to flip the power off on my computer, flip is back on and pick up where I left off.
I should be able to move a hard drive from one computer to another and have it “just work” every time, regardless of differences in hardware.

Make it “just work” already, I’m getting tired of this.