How can I stop random shut downs on my MBP?

15" MacBook Pro - late 2007
Mac OS 10.7.3
2.2 Ghz Intel Core 2 Duo
4 GB ram
NVIDIA GeForce 8600M GT 128 MB
I've been getting random shut downs for several weeks. It basically is like a power failure: straight to black, no warning, no reboot. Sometimes a very short beep/buzz occurs right as it dies. It seems to happen when I'm moving, holding, or have my hands resting on the computer, but not always. I've done the SMC and PRAM resets. I did a clean install of Lion. I just put in a new battery. I'm starting to think that it has to be the motherboard. Any suggestions or ideas?
Oh, and the error in the console is always the same: "kernel: Previous Shutdown Cause: -2."
Message was edited by: davishmcclurg

I did not run the extended test, but I did take it into the Apple Store and they could not duplicate the problem. They told me they ran hardware tests on my software as well as their own and it never happened.

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1. This is a comment on what you should and should not do to protect yourself from malicious software ("malware") that circulates on the Internet. It does not apply to software, such as keystroke loggers, that may be installed deliberately by an intruder who has hands-on access to the victim's computer. That threat is in a different category, and there's no easy way to defend against it. If you have reason to suspect that you're the target of such an attack, you need expert help.
If you find this comment too long or too technical, read only sections 5, 6, and 10.
OS X now implements three layers of built-in protection specifically against malware, not counting runtime protections such as execute disable, sandboxing, system library randomization, and address space layout randomization that may also guard against other kinds of exploits.
2. All versions of OS X since 10.6.7 have been able to detect known Mac malware in downloaded files, and to block insecure web plugins. This feature is transparent to the user, but internally Apple calls it "XProtect." The malware recognition database is automatically checked for updates once a day; however, you shouldn't rely on it, because the attackers are always at least a day ahead of the defenders.
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It only applies to software downloaded from the network. Software installed from a CD or other media is not checked.
As new versions of OS X are released, it's not clear whether Apple will indefinitely continue to maintain the XProtect database of older versions such as 10.6. The security of obsolete system versions may eventually be degraded. Security updates to the code of obsolete systems will stop being released at some point, and that may leave them open to other kinds of attack besides malware.
3. Starting with OS X 10.7.5, there has been a second layer of built-in malware protection, designated "Gatekeeper" by Apple. By default, applications and Installer packages downloaded from the network will only run if they're digitally signed by a developer with a certificate issued by Apple. Software certified in this way hasn't necessarily been tested by Apple, but you can be reasonably sure that it hasn't been modified by anyone other than the developer. His identity is known to Apple, so he could be held legally responsible if he distributed malware. That may not mean much if the developer lives in a country with a weak legal system (see below.)
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A malware attacker could get control of a code-signing certificate under false pretenses, or could simply ignore the consequences of distributing codesigned malware.
An App Store developer could find a way to bypass Apple's oversight, or the oversight could fail due to human error.
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