Computer completely freezes when the letter "b" is typed

Recently, our 17" Macbook (early 2008), which we bought "refurbished" from Apple two months ago, would freeze up and give the message "You need to restart..." several times a day, then there were the three nasty start up sounds after that issue. The latter was rectified with new memory, and it occasionally gives the "You need to..." message.
However - now the computer completely freezes when the letter "b" is typed. And - No - I'm not making this up. Just freezes - the "b" doesn't show up at all. Sounds like a Monty Python routine - the one about the "travel agent". What could it be - and more importantly - should I ever buy a refurbished computer again?

Your refurb is covered by a warranty just like any other Apple product.
I had a refurb a few years ago and had a few minor issues with it. On the 4th trip to the "doctor's" Apple offered us a replacement and couriered a brand spanking new MBP to our doors.
The moral of this story is, Apple do care for their customers, take yours back to the shop.

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Computer completely freezes when trying to play video

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I have since posting this question looked at the OS X Console, and have seen these errors, which sound correlated to my problem of playing video from a variety of cameras, including iPHone 4. I also tested playback on my newer Mac laptop and have no trouble at all.
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Computer completely freezes when downloading music

I purchased an album and after downloading a few songs, the whole computer freezes up and there is nothing i can do but turn the computer off using the power button. need some help

I have never heard of an issue like that.
As this forum is dedicated to the new MacBook Pros, you should have your question posted in the following forum too.
http://discussions.apple.com/forum.jspa?forumID=1149
I have not written this to be rude. It is just that you are more likely to find help in that forum, as it has far more users and experts.
I would contact Apple right away. Let customer relations know what has happened too. Apple customer relations: (800) 767-2775
Apple will do their best to make things right!
Good luck!
Message was edited by: LukeD

When i turn on my computer it freezes in the white screen and the spinning wheel and it won't move from there ... I have turned it off and on several times and took out the battery and it keeps on doing the same thing again what can i do ???

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Here is some pertinent information and how-to's from Apple:
http://support.apple.com/kb/TS2570
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Why does Safari freeze when the cursor hovers across "Bookmarks"?

Safari v 4.1
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Hi Carolyn.
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I’m letting you know about these details before I proceed with your instructions.
Thanks for responding,
Rafael
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jamiesfromportland, greetings: I do not take issue with your very valid reasons for purchasing RAM from Apple. However by recommending not to purchase RAM from third party vendors I would suggest is unfounded advice. Most of the problems that occur with third party RAM are attributable to the lack of adherence to the required specifications, viz. this post.
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Get Temperature Monitor to see if it's heat related...
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Hello Teddy1602,
Thanks for visiting Apple Support Communities.
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Computer completely freezes when the letter "b" is typed

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