Finder freezes on first start, But ok on restart

Whenever I first start up my Mac Pro, it can load all the way up to the desktop background, but the dock and bar on the top along with Macintosh HD don't load and the spinning cursor appear. However, if i restart the computer after that, everything loads fine.
I don't know what's causing this. Please help me.
Thanks
-Nick

My first thought is the backup battery is dead or near dead. When you first boot up, it may be that because of the low battery your settings are corrupt and it freezes. On the second boot up, now that the system is all charged up and there is power to the PMU/PRAM (or whatever they call it now), that it has enough to properly reset or overcome bad PMU settings and restart properly.
If your iMac is over a year old and you have never changed that battery, now would be a good time to check that. One thing you can try is simply removing the battery completely. The PMU will reset every time the computer is powered down, but if the computer now starts reliably every time, then that was your problem.
Another possible troubleshooting cause...
Intel-based iMac, Intel-based Mac mini: How to reset the System Management Controller
http://support.apple.com/kb/HT1543
Patrick

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