I have a 2010 Mac Pro 6-Core 3.33Mhz with 12GB ram (3x4GB sticks) and 4x2TB Western Digital Black Caviar internals). What I purchased this system in 09/2010. After taking out the 2gb of Apple memory and adding in the 12gb from OWC, and adding in my internal hd`s, I was up and ready to go. I have no issue with the computer - except for one. The computer powers up an normal speed to the sign in screen, and after inputting password, goes to the desktop. This is where one of two things happens rather frequently. Half the time, the desktop loads 100% with no issue and when I click on the finder, the new finder window opens, showing me all the drives in my Mac Pro. If I click on one, in order to show me what is inside each drive (the folders and files) - the beachball appears and often times in spins for a minute or two before showing the contents of that drive. The other half of the time, the desktop loads slowly and then the beachball appears and keeps on spinning and freezes the system and I have to hold the power button to power down the system. I have a way fast system (on paper). I am not running anything heavier than Photoshop on my computer. I have more than enough memory. And my drives are ALL virtually empty. And this problem is happening upon just starting the computer at the desktop level, so it`s not like I am running 5 programs at the same time or anything taxing to the system. I have sent the computer out to Apple for a lookover. Just wondering what could be causing this issue. Desktop either loads fine or it doesn`t. And when it doesn`t, the damn beachball. I notice when I repair the disk permissions, it acts as a bandaid for this problem, but only for the first few start-ups, then back to same issue. I feel like for what I do with this system, and the guts of my system, it should be lightening fast. Any thoughts as to what it could be? Just curious as I wait for Apple to tell me the news.