Macbook Pro with sudden "rough idle" noise

I have a Macbook Pro from late 2007. I used it this morning and everything was fine. When I got it home from work today and opened it up, there was a constant "rrr-rrrr-rrr" noise that I think is coming from the hard drive. When the fan comes on, the noise speeds up. It's on the whole time my computer is open. Here's the really strange thing: if I lift it up and turn it perpendicular to the ground (R side down only) the noise goes away completely! As I slowly turn it back to set it on the desk, the noise gradually returns. If I turn it toward the L side, the noise speeds up and is a constant "rrrrrrrrrr" the entire time it's in that position. Seems to me like something's loose but that's a shot in the dark.
I have everything backed up on Time Machine. Anyone have any thoughts???

You can run the extended version of the Apple hardware test to see if you get an error code indicating a failing fan.
If you are concerned about your hard drive, you can also download and run SMART Utility:
http://www.apple.com/downloads/macosx/systemdiskutilities/smartutility.html
You can download the demo and run it several times for free. It is somewhat more critical than Disk Utility, and may detect impending hard drive failure sooner.
That said, your noise sounds more like it may be fan related--maybe a blade rubbing on the housing or a bearing starting to go out. If a fan is failing, you do want to replace it, or possibly even both of them. Sometimes if one fan stars heading south, the other has to work extra hard to try to keep the computer cool, and it may become compromised as well.
Good luck!

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If you have more than one user account, you must be logged in as an administrator to carry out these instructions.
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Go to Apple menu -> System Preferences -> Keyboard and Mouse -> Mouse
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Message was edited by: inquisitive7

Interesting - but that poster is complaining about the mouse and keyboard being unresponsive or going dead, not the comprehensive freeze I'm experiencing (unless "go haywire" means freezing). Not only are my mouse and keyboard unresponsive, but windows on the screen stop updating - even the clock in the upper right corner stops advancing.
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Message was edited by: inquisitive7

Macbook Pro with sudden "rough idle" noise

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