Macbook Air (OS Lion) with very slow start up

Hi all,
I do not know why but my Macbook Air with OS Lion is taking to long to start up and this problem started without any reason.
The Software if updated.
I surfed on internet trying to find a solution, I experimented several potencial solutions but till now I could not solve the problem.
It is very quick shutingdown but it takes arround 30 min. to start up.
Thank you very much for your help

Hi there. Thanks for your comments.
I have tried all the different combinations of RAM setup, and as stated in my initial topic, the Mac Pro boot up time only slows when I have more that 2 modules. Where I place these does not seem to make a difference.
I have taken the Mac Pro to an Apple Reseller technician yesterday and they where not able to find any RAM errors. Apparently the boot up time is within Apple's acceptable parameters for this set up.
Could anyone that is running a Mac Pro 2009 with more that 4 modules of RAM, please let me know if the boot up time is normal. ( the time it takes from pressing the power button to seeing the gray screen around 16 - 20 seconds)
Or is anyone else having the same issues?
thanks for your responce

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Hi there. Thanks for your comments.
I have tried all the different combinations of RAM setup, and as stated in my initial topic, the Mac Pro boot up time only slows when I have more that 2 modules. Where I place these does not seem to make a difference.
I have taken the Mac Pro to an Apple Reseller technician yesterday and they where not able to find any RAM errors. Apparently the boot up time is within Apple's acceptable parameters for this set up.
Could anyone that is running a Mac Pro 2009 with more that 4 modules of RAM, please let me know if the boot up time is normal. ( the time it takes from pressing the power button to seeing the gray screen around 16 - 20 seconds)
Or is anyone else having the same issues?
thanks for your responce

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