MacBook Pro w/ OSX v10.6 refused to restart- reinstalled now slow

OK- here is what happened/I did:
1.  I used it fine with FinalCut Pro, watching videos with QT10 and closed the lid one night, two weeks ago.
2.  Next day I opened the lid and tried to view a video with QT10 only to be told that that version of QT was not compatible with my OS.
3.  So I did the natural thing and tried to repair permissions.  Only to be told that my version of Disk Utitility was also not compatible with my OS installation.
4.  I checked iTunes and it played.  Checked one other Mac app and it too worked fine.
5.  Decided to restart and it wouldn't.  Got stuck on the grey screen with the timer clock going round and round for a good twenty minutes.  Tried again, with forced shut-down.  No dice.
6.  Safe restart- no dice either.  Still going round and round (with the status bar popping up and disappearing in ever decreasing times every other time I tried.
7.  Backed up crucial data NO problem a week or so ago, and then used its disk to do an archive reinstall.  Took a while, made all apps behave as though they were opening for the first time (which I expect, kind of).
What I now note:
1.  But now I get the following message when I repair permissions:  "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired."  I was going to ask just what that meant but thought I'd better put it in context.
2.I also have issues with Firefox which is on "go slow" in loading pages, the Bookmark tab is practically unselectable and will not drop down menu.
3.  The computer, though now restartable, is very slow in starting.
4.  I noted that the OS version went back down to 10.6.3 (to be expected of course)after the archive install, and that an update I just did (which seemed to not install OS updates, rather concentrating on iPhone/iTunes) went very quickly but DID upgrade to 10.6.8.
5.  I struggle to eject external hard drives of late...  In fact last thing- they didn't at all.    The colourful beach ball is about a lot- not a happy bunny, me.
Can you advise?  Please and thank you.

OK- here is what happened/I did:
1.  I used it fine with FinalCut Pro, watching videos with QT10 and closed the lid one night, two weeks ago.
2.  Next day I opened the lid and tried to view a video with QT10 only to be told that that version of QT was not compatible with my OS.
3.  So I did the natural thing and tried to repair permissions.  Only to be told that my version of Disk Utitility was also not compatible with my OS installation.
4.  I checked iTunes and it played.  Checked one other Mac app and it too worked fine.
5.  Decided to restart and it wouldn't.  Got stuck on the grey screen with the timer clock going round and round for a good twenty minutes.  Tried again, with forced shut-down.  No dice.
6.  Safe restart- no dice either.  Still going round and round (with the status bar popping up and disappearing in ever decreasing times every other time I tried.
7.  Backed up crucial data NO problem a week or so ago, and then used its disk to do an archive reinstall.  Took a while, made all apps behave as though they were opening for the first time (which I expect, kind of).
What I now note:
1.  But now I get the following message when I repair permissions:  "Warning: SUID file "System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent" has been modified and will not be repaired."  I was going to ask just what that meant but thought I'd better put it in context.
2.I also have issues with Firefox which is on "go slow" in loading pages, the Bookmark tab is practically unselectable and will not drop down menu.
3.  The computer, though now restartable, is very slow in starting.
4.  I noted that the OS version went back down to 10.6.3 (to be expected of course)after the archive install, and that an update I just did (which seemed to not install OS updates, rather concentrating on iPhone/iTunes) went very quickly but DID upgrade to 10.6.8.
5.  I struggle to eject external hard drives of late...  In fact last thing- they didn't at all.    The colourful beach ball is about a lot- not a happy bunny, me.
Can you advise?  Please and thank you.

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    I don't know if this will help someone but I am posting this for that purpose.  In the past when I first had this problem, I'd read a post somewhere (sorry, long ago, don't have the link) where an individual was having the same problem and they stated that when the MBP got heated, that's when the keys would stop working, and they went into the MBP and jiggle some stuff around (a specific wire, I'm not electronically inclined so I know NOT of what they spake!).  Well I didn't want to do that but it always stuck in the back of my mind.  I had given up, really, and was planning to take my MBP to the apple store.  But by chance one night I left my MBP on the floor where it's cool, and when I turned it on, the problem went - poof! It seems there was some validity to the post that spoke about heat, because my problems started when I would stream foreign dramas on my MBP for hours at night, and I would hear the fan going off all the time, and in the mornings, my "p", "enter", "0", ";", and all the function keys would stop working. 
    So, maybe try keeping the MBP in a cool place when it's off.  Since I've started doing this overnight every night (keeping it on the cool floor, out of reach of any big feet), I have not had a single problem with my keyboard.
    Hopefully this might help someone.

  • HT1338 Dear all, I have just bought a MacBook pro with osx lion on 25thast month. I wanted to know if I can use the methods described above to update to osx mountain lion or I have to buy osx mountain lion from the app store?

    Dear all, I have just bought a MacBook pro with osx lion on 25th last month. I wanted to know if I can use the methods described above to update to osx mountain lion or I have to buy osx mountain lion from the app store?

    Here are the rules to qualify for the free upgrade:
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