Pause before boot sound, should I worry?

Just yesterday I started noticing that whenever I power up my MacBook Pro it's taking around 15-20 seconds between the time I press the power button and when I hear the Apple bootup sound. During this time the screen is blank and I hear none of the usual startup noises. This only happens when cold booting, not when waking up from sleep. Should I be worried?

Thanks. I guess what's bugging me is that this only seemed to show up in the last couple of days. Normally (meaning before now) the boot sound was almost instantaneous after I pressed the power button. But perhaps I'm just a little gunshy after reading all the problems other people have had with their MBPs. So far I've not had any (other than the fact that it's hot, but CoreDuoTemp tells me it's not to the point where I have to worry about damaging the processor).
Week 10 MacBook Pro 2.0gHz Mac OS X (10.4.7) 2GB RAM

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