Random Pause before booting OS

I have a uMBP 13" that I picked up about a month or two ago. Last night when I turned it on the SuperDrive made the normal "zip-zeep" noise before booting, but the screen was black and the display standby LED was lit. After about 3-4 seconds it booted like normal. This has happened once before when I restarted my computer (at that time on Leopard). Currently I'm on Snow Leopard.
I'm not sure if this is normal or not, but I suspect the EFI 1.7 and it's screwy SATA goodness to be a culprit if there's an issue. Note that everything else has been fine, and I've had no glitches while actually operating the laptop.
Any help or explanation would be greatly appreciated.

PSU: ATX switching power supply
+5V 35A
-5V 0.5A
+12V 16A
-12V 0.8A
+3.3V 24A
+5 2A
Yes, that's pretty weak for modern machines. Go for better one.
Go for quality PSU single rail with 30A[or more] @ +12V
>>> PSU's---2 x 12v---The Dual Rail Myth <<<
>>> Is your problem caused by your PSU? <<<
More information: https://forum-en.msi.com/index.php?topic=112039.msg836246#msg836246

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Random Pause before booting OS

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