My Macbook Pro keeps shutting down

Question

I took the mac book pro into the mac store for them to check it out they said every thing is fine seems to be working a little better than it was except when I am on some web pages it shuts it self down and reboots it self I went to the utilities and looked in console I then looked in the Crash logs all I am finding when i click that arrow under that is ADOBE DOWNLOAD ASSISTANT 6/24/11. THIS IS A OLDER MAC BOOK PRO FROM 2006 besides that just this issue.
I looked in the logs and keep seeing this can someone help
com.apple.launchd.peruser.501[86] (0x101f30.mach_init.switchboard.sh) Failed to check-in!
here is the rest of the logs
com.apple.launchctl.Aqua[88] launchctl: Please convert the following to launchd: /etc/mach_init_per_user.d/com.adobe.SwitchBoard.monitor.plist
com.apple.launchd.peruser.501[86] (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
com.apple.launchd.peruser.501[86] (com.apple.Kerberos.renew.plist[110]) Exited with exit code: 1
com.apple.usbmuxd[22] HandleUSBMuxDictionary client 0x301da0-iTunesHelper/com.apple.iTunesHelper using library usbmuxd-211 built on Jan 13 2011 at  running usbmuxd-211 built on Feb  8 2011 at 13:49:42
com.apple.launchd.peruser.501[86] (0x101f30.mach_init.switchboard.sh) Failed to check-in!
com.apple.launchd.peruser.501[86] ([email protected][114]) Exited with exit code: 1
kernel npvhash=4095
/System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer[118] No valid tickets, timing out
kernel PAE enabled
kernel Darwin Kernel Version 10.7.0: Sat Jan 29 15:17:16 PST 2011; root:xnu-1504.9.37~1/RELEASE_I386
I would like to know what that switch board thing is  last i did run the apple combo update from the Apple website seems like that took care of some problems.  if someone can help let me know what it is thank you

Answer 1

It could be - and I'm not sure about this - the dreaded 2010 Intermittent black screen or loss of video problem.
Take a look at the Knowledge Base article and see if your unit displays any of the...
Symptoms
Apple has determined that a small number of MacBook Pro (15-inch, Mid 2010) computers may intermittently freeze or stop displaying video on the built-in display or on an external display connected to the MacBook Pro. In this situation, you may also see a restart warning message before the video is lost or the display turns black or gray. Affected computers were manufactured between April 2010 and February 2011.
If it seems as if you do have any of the symptoms, get your machine to your local Apple Store or an AASP and have them deal with the issue - which may mean replacing the logic board. But it will be a free fix as there's no expiry date for the problem listed in the KB article.
Good luck,
Clinton