My laptop used to work fine with Windows 7 Home edition. Today I installed SP1 and now its shutting down abruptly. There are no error messages, nothing in event viewer. It doesn't even say that it was shutdown abruptly when i reboot. Anyone had similar issues with SP1 ? Update: After lot of troubleshooting finally I am able to solve this issue. This is due to (I think its a bug/incorrect implementation) processor throttle functionality in WIN7. It is supposed to throttle down the CPU when the temperature is high and fan will not be able to cool it down (They should use temp increase rate as deterministic policy and not some stupid active/passive setting in power policy) , But its not doing that and that's causing abrupt shutdown. I changed my power policy and limited maximum processor speed to 80% (that is correct, I am asking WIN7 to run my CPU slower than what it is capable of) of the maximum frequency. I did stress test at this frequency and everything seems to be ok. In my opinion it is better to use the manufacturer power manager software than using Windows built in power manager. Now i remember that after i uninstalled the Thinkpad power manager to use Win 7 power manager i started having all these issues. As always i think its safe NOT to use new windows features immediately after the release.

Hi, First, thanks for your update. According to your description, I need to clarify that this issue is nothing to do with Windows Power Manager. It may be caused by the Power Supply or the Mainboard, please keep monitoring the issue, if it occurs again, feel free to give us any updates. I will change the thread to discussion, based on it is already resolved. Thanks again.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.