I just got my 13" Macbook Pro back from the Apple Store, where they replace a faulty logic board. Ever since this happened, the computer has been beachballing, lagging, and has some problems. 1. I cannot change my account from Standard to Admin. When System Preferences asked for an admin password, I gave my root. The weird thing is, when I click on the box to Allow This Account to Administer This Computer, my check mark goes away and a sheet appears telling me that I need to restart my computer to apply this change. For some weird reason, it doesn't change when I restart. 2. Software Update doesn't work, as in it won't install. I typed my root password in and let Software Update check and download updates. When it tells me that I will have to restart my computer after installing this, I click okay. The license agreements pop up, and I agree to all of them. Then, they disappear, leaving the window that asks me if I want to restart. I have to download my updates manually, which is a pain. 3. The computer lags. While I am typing this, the beachball appears for five or ten seconds at intermittent intervals. 4. The graphics seem to be a little laggy, as well. I checked in System Profiler and the card is confirmed to be a 9400M GT, and my processor has been confirmed to be an Intel Core 2 Duo 2.53 GHz with 3 MB L2 cache. 5. When I am typing or surfing plain text internet, the body of the computer gets rather hot, but the fan doesn't spin up. It just sits there at 2001 RPM. 6. This is weird, but with the system at 98% idle and only Safari open, the battery life is dropping life crazy. Can any of these problems be caused by replacing the logic board?