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my office is having some power problems, and I was wondering if there is anything in windows 7 (or software anyone could recommend) that would help monitor the power fluctuations. I have a windows 7 thinkpad (t400) plugged in perpetually - is there any way to see the history of when it switched from plug to battery and back?


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This question was actually already answered here Triggering tasks and running programs when Windows 7 is plugged in or unplugged? if you read the answer that states what the situation is, and what kind of solution you can use for your situation. Note, your question isn't a duplicate of that question, it is just that your question is answered there.

Or, you could just set the laptop to Sleep after 1 minute of being on battery, and then later look through the logs for event ID 42 in System log from source Kernel-Power as that would be a Sleep event.

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See if this software does the trick, unfortunately it does not log anything, so if the PC shuts down, sleeps or hibernates, the broadcast events will be lost.


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