Sudden power down

Hi everyone, I've got a 13" MacBook (white) and since last night, it started suddenly powering down on its on, while I was on AC power (with the battery in). Prior to that, I was having problems with the fan suddenly going into overdrive although there was no increase in activities on the MacBook. After googling the problem, I reset the SMC and all seemed well for a while, and in fact, performance seemed smoother. Then the problem of the sudden power down started again. I tried resetting the SMC again and took out the battery after noticing a bulge at the side of the battery. It's probably the third time that I've reset the SMC, but it seems like the problem still persists. Does anyone have any suggestions on how to troubleshoot the problem?
Cheers!

It could be an overheating issue (which may also be causing your battery to swell).
When you notice the fans going, open Applications/ Utilities/ Activity Monitor. Change the pull-down menu from "My Processes" to "All Processes" and sort by the CPU column. Is there a process running very high, say, over 25% of your CPU?
You can also download iStat and use it to monitor your temps and the fan speed:
http://www.apple.com/downloads/dashboard/status/istatpro.html

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