If you didn't use the keyboard, never closed the screen, never used the battery... It should last a good 5 years. The HD is almost always the first thing to die on a laptop. Hinges and shorts in the screen would be about as likely, unless you really didn't use it. Then there's the case of dropping the laptop...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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