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A fresh install is a 100% waste of time and not the answer to the "problem".

Select the hard drive from the preferences and reboot. Problem solved.
 
selecting the startup disk worked for me as well. was also getting a very long white screen before the apple. after rebooting it loaded much faster - didn't time it though.
 
Yes that's right -- even my white screen was painful at about 25-30 seconds and then the apple logo for about 10-12 seconds, and then the loader wheel for around 10-12 more amounting to about 45-50 seconds.

I changed the Startup Disk to Hard drive and now it's half of that. My macbook pro with an OCZ Vertex 60G installed in it, boots up with Firefox/Adium/Skype in about 15-18 seconds. I can't wait to install a OCZ Vertex Turbo in my new iMac Core i5.
 
What is the exact reason behind slow boot up?

Dear all,
I have recently done the clean install of snow leopard to my macbook pro 13inch. Very happily, I started installing all the software upgrades, ilife, etc, but then I noticed-as everyone eventually notices- that booting time is dramatically slow to the extent that it causes a big nostalgia to leopard system...:) [It was about 45-50 seconds] Anyway, I somehow remembered, among all this messy psychology, that I shut and restart the computer before installing the software updates of 10.6.02, etc, and then I suspected that perhaps one of the updates were the reason. As an amateur detective, I would like to track down the sinner... Anyhow, I did the clean install of snow leopard again. I checked the times of startups (from pressing the startup button till the desktop readiness) and shutdowns, and I did not install any upgrade, any ilife app, or any personal data, etc. Here is the result of three tests: Average scores for shutdown=3-5 seconds; average scores of startup= 28-32 seconds.Then I installed the combo pack of 10.6.02, Itunes and Remote Desktop Client updates, and after finishing the installations, I run three more tests. Here are the scores: Average scores of shutdown=4 seconds; average scores of startup= 45 seconds... This is my tentative conclusion about the whole issue: Apple decided to solve some problems of Snow Leopard like the famous guest account problem, etc, on the risk of making one of its very particular good features of speedy start up to catch windows boot-up times... I really did not like this, and all the evidence seems to be indicating this conclusion. So what is the next step, shall we wait for one more update combo to fix this slow boot up problem or entertain for a while the speed of 10.6.0 without installing any update?
 
If it's booting slowly, try this first:

Go to System Preferences > Startup Disk and select your internal HD.
On my new iMac 27/4Gb/i7 this reduced the time between pressing the power button to appearance of desktop wallpaper from 60 to 30 secs. On my G4 powerbook/10.5.8 it made no difference.
 
the first 2 times i started my new imac it took a while before the apple logo appeared but now it is really fast and i havnt changed anything or done a fresh install
 
If it's booting slowly, try this first:

Go to System Preferences > Startup Disk and select your internal HD.

I'd like to add another voice of thanks. Doing as you recommended cut the boot time for my new 27" iMac from about 55 seconds to 24 seconds. Thank you!
 
New Imac 21.5'' slow startup fixed!

I had the same problem with the slow startup and was very disappointed in my machine after reading all the benchmarks posted.. I tried selecting the Hard Drive in the system preferences / Startup as mentioned above and it worked perfectly! It starts up very quickly now. Thanks!.. I had initially loaded the new computer from a Time Machine Backup.. I'm not sure if that had anything to do with it or not.
 
Fantasticly simple!

Big thanks to C64!

I went in and chose iinternal HD i Sys Prefs and now startup is 34 secs in stead of 71!! Incredibly simple fix. Thanks!
 
Thanks! Start Up Solved Easily!

A fresh install is a 100% waste of time and not the answer to the "problem".

Select the hard drive from the preferences and reboot. Problem solved.
GREAT solution. My previous i5 took about 25 seconds to boot and my new i7 took about a minute. I followed this suggestion and my i7 boots up just as fast as the i5! You helped me where no one else could! Not that it was a major issue but what an easy solution!
Thanks!:)
 
Boot Up takes 30 seconds MAX

After selecting the Macintosh HD from "Startup Disk" in System Preferences your Mac bootloader no longer has to search for the available drives. It knows it has to select the Macintosh HD, and therefore doesnt waste time, so it boots up faster.
 
I always do a fresh install on any new computer. I have had too many machines (mostly from Dell) that have had botched factory installs.

Or bloatware and partitioned hard drives. F I hate getting new systems from them
 
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