MacBook Pro Random Alert Pluck Sound

Was researching as I kept hearing what sounded like a guitar pluck sound randomly with my new MacBook Pro. I found a post on the support forums with the same questions but couldn't answer there so I'm posting a new message to inform those that are being driven crazy by this sound.
Microsoft Entourage appears to play this sound when it checks mail and there is "No New Mail" which means you might hear it every 5 minutes or every hour depending on your settings and how many accounts it checks.
You can go into the Preferences>>General Preferences>>Notifications to turn off the alert sounds. Not sure why anybody needs an alert that they have no mail except to drive them absolutely crazy.
Hope this helps somebody. I can now work in peace.
-mt

HUMM ... $MS$ ... HUMM Must have been put in the code by a 'no email' developer
larry

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    I have a Mid 2010 15-inch MacBook Pro, on which I have been running Snow Leopard, Lion and Mountain Lion with no problems. But recently I have been working with my computer when suddenly screen turned black and the computer restarted. (Actually, when it restarted for first time it shut down before the startup sound, but booted up without problems after I turned it on via the power button.) Since it was the first time I didn't pay attention.
    Then after a few days it happened again, but this time the computer didn't seem like booting up again. When I finally got to the grey screen I tried safe booting with verbose mode, which sadly ended with the same restart after “DSMOS has arrived” line. From this I assume the problem won't lie in non-stock kernel extensions. I also tried resetting NVRAM with no success.
    I had a flash drive with stock Mountain Lion installer, succesfuly booted it up and let it run for a while, after about 15 minutes it shut down with the same black screen. From this I assume that the problem dosen't lie in my current Mountain Lion installation.
    From report logs I can tell two kernel extensions common to all the restarts: com.apple.NVDAResman, com.apple.nvidia.nv50hal; and four appearing only in some cases: com.apple.driver.AGPM, com.apple.GeForce, com.apple.iokit.IONDRVSupport, com.apple.iokit.IOGraphicsFamily.
    This made me suspicious about the dedicated Nvidia graphic card. I installed an utility called gfxCardStatus, which not only shows which card is currently in use, but also allows for force using of specific card. I also installed NovaBench to have some GPU-heavy benchmark available. When I run NovaBench, the computer switched from integrated to dedicated card with no problems, and the benchmark succesfuly finished. But when I tried forcing switch to any of the cards the computer restarted with the black screen. This made me suspicious about the logic board instead of specific graphics card.
    The problems also occurs when waking up form sleep. Sometimes it would wake up normally, but sometimes it would immidiately restart to a grey screen saying “Your computer restarted because of a problem. Wait a few seconds or press a key to continue starting up.”
    To summarize the problem, the computer restarts randomly and fails to wake up from sleep sometimes. I got it as a gift from my father, who lives in Slovakia and have bought it from local reseller. The problem is that I live in Czech Republic and I have some doubts regarding the quality of support at resellers. (Namely I am afraid they will say “See, it runs. There's no problem.”) Also I need to constantly work on a project for school competition, which is mostly done in Photoshop, and longer time without my computer would severely threaten the deadline. I would be very grateful to first have an opinion from Apple empolyee, who really has an in-depth knowledge of MacBooks and Mac OS X.
    Update: After writing this I tried resetting SMC, again with no success.
    Thanks in advance.
    Yours faithfully
    Samuel Novák

    I had already given my MacBook to dad, but in Slovakia they have horrible laws towards customers. The reseller has taken 2 weeks just to make a statement, which is ridiculous since I had sent the MacBook along with a detailed description of the problem and printed Apple article. It seems they have found the machine to be faulty and took another 30 days to fix it.
    I am more than happy to hear that Apple in this case promises to replace the logic board free of charge. It is a powerful machine and I don't want to replace it yet, but if I were about to pay for a new logic board I would consider buying a new laptop.
    Next time I would want to buy anything from Apple I would to one of official Apple stores in Austria, although it seem that not all the employees can diagnose certain issues the quality of service must be incomparable. These almost two months without MacBook, or Photoshop, have ruined my chances to participate in a countrywide student's projects competition, I must wait for the next year and that would be the last chance since I would be leaving high school.

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