Nope. Some wires have things like "USB" or "IDE" written on it, and the Hard Drive and CD/DVD/floppy reader chords are colour coded, but not the main parts. PC building isn't as easy as it seems...
Here's a quiz to see if you're ready to build a 64-bit PC. Post your replies and I'll tell you if you're ready. Do this from your head, not from google
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A) What is the difference between an s754 and s939 processor?
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B) What is newer: AGP or PCI Express?
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C) What's the min. voltage you should have for a 64-bit system's Power Supply?
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D) What's a Heatsink?
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E) True or False: You should NEVER ground yourself before installing computer parts.
(True) (False)
F) True or False: BIOS is required before you can start the computer.
(True) (False)
G) True or False: 99% of the time, BIOS DOES NOT come with the Motherboard.
(True) (False)
H) What does CPU stand for?