Why does my Macbook Core 2 Duo 13" keep shutting itself off and/or repetively rebooting on its own?

My Macbook Core 2 Duo 13" won't stay on for any significant time anymore. When it does, it seems that the slightest movement, or pressing a key will shut it down or it just shuts down on its own. Or it reboots repetitively after chiming. Or it remains on as it is doing now for the last 30 minutes, long enough to see if it needed a firmware update. It's never on long enough to really use it anymore.
When there is no image on the screen, I often can hear the fan or drive running quietly in the background. I can turn it off by powering down with the button. Without the power cord, it will eventually drain the battery if I don't force shut it down.
I have verified that the hard drive is OK by removing it and mounting it externally.
I have been unable to do a hard system reboot (hold down powerbutton until system starts and continue to hold until tone) - no tone, just keeps rebooting.
When it stayed on long enough, I tried to install the firmware 1.1 update. Message was that it didn't need it.
I have tried removing one RAM card at a time ( it has 1GB + 512Mb). Haven't really noticed any change. "POST" message is OK when it starts
Any ideas? I've looked at all the "usual suspects". Thanks!

Try resetting the SMC and pram
Laptops with a battery you can remove
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery.
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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Why does my Macbook Core 2 Duo 13" keep shutting itself off and/or repetively rebooting on its own?

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