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Since the question doesn't specify when the pinwheel icon appears, there could be various reasons. It could be connectivity issues with your modem, installed software is taking awhile to load, your browser's flash media might have quit unexpectedly, depending on how old your MacBook Pro is, your hardware might be having a difficult time keeping up with accessing or loading an application.
What else can I help you with?
Which macbook is better than MacBook Pro or air?
MacBook Pro is the best you can get
Which is better sony vaio or macbook pro?
MacBook Pro!
Is msi gt780r better or MacBook Pro?
The macbook pro!
Should you get a MacBook or a MacBook Pro if you will use the laptop for music internet and photos?
you probably should get the MacBook. they are cheaper than the MacBook Pro. now, if you want a bigger screen, then get a MacBook Pro.
What age can you get a MacBook Pro?
There is no age limit for getting a MacBook Pro.
When was MacBook Pro created?
MacBook Pro was created on 2006-01-10.
Does the MacBook Pro have a lithium battery?
Yes, the MacBook Pro has a lithium battery.
What is the difference between a MacBook Pro case and a macbook air case?
The MacBook Pro cases are much larger and sturdier the the MacBook Air cases.
Why MacBook Pro does not release in WWDC 2013?
The Macbook Pro was upgraded ,as well as the iMac.
Can you replace the cd/dvd drive in a macbook pro?
Detailed instructions for doing this are here: http://www.ifixit.com/Guide/Mac/MacBook-Pro/SuperDrive/85/6 however this will void your warranty if you are not an apple certified technician.
Should you get a MacBook Pro or a air?
Macbook air
Does MacBook Pro have an internal cooling fan?
Yes the MacBook Pro has an internal cooling fan.
