I installed Windows 7 Service Pack 1 (official release on Technet) successfully few days ago.
However, I encountered this error: internal_power_error when I attempted to hibernate my system. I have tried this command: powercfg /hibernate /size 100 to allow bigger size of the file for hibernation. Unfortunately, the error still occurs.
This error does not happen on Windows 7 without Service Pack 1.
Please start the Windows Explorer and go to the folder C:\Windows\Minidump. Next, copy the dmp files to your desktop, zip all dmp into 1 zip file and upload the zip file to your public Skydrive  folder and post a link here.