My new macbook air sometimes has trouble starting up. It gets stuck at various stages. I have reinstalled Lion twice. That solves the problem for a few days and then in reoccurs. Any ideas? Thanks, Marty

My new macbook air sometimes has difficulty booting up. I reinstalled Lion twice. That soves the problem temporarily and then after a few days it reoccurs. It also has trouble at times opening mail or Microsoft Word. Any ideas? Thanks, Marty

Marty,
Can you elaborate on what you mean by "difficulty" during the boot sequence? When/where is the difficulty occurring? Are you getting to the Apple logo? Apple logo with spinning gear? Blue screen? Login window? There's many phases to the boot sequence and when it fails can go a long way in determing what's causing the problem.
Also, what sort of third party software is installed? It sounds like at a minimum you've installed Microsoft Office? Anything else?
Lastly, after you reinstall Lion do you perform a restore from backup or remigrate your data/content right back into the new OS? If so that could potentially be the problem right there. But truthfully there's more information that needs to be provided to begin recommending troubleshooting steps.

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I figured out how to fix the flashing yellow screen problem that I've been having on my MBP! Yessssss!!!
I found this super handy website with the golden answer: http://support.apple.com/kb/HT1379
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Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Elaine

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When iMovie doesn't work as intended this can be due to a lot of reasons
iMovie Pref files got corrupted - trash it/they and iMovie makes new and error free one's
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Creating a new User-Account and log into this
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Event or Project got corrupted - try to make a copy and repair
a Codec is used that doesn't work (even though iMovie and/or iDVD tries to / they fail in the end)
version miss match of QuickTime Player / iMovie / iDVD
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