My Toshiba M45 restarts instead of shutting down with AC power. It will shut down with battery.
Go to power management options and check how your computer shuts down.
When pressing Button Power down->Will Shutdown When closing lid->Go to sleep. I go to Start->Shutdown(and it is restarting everytime) only when AC power is connected. If I remove ac ( only battery is on) the sytems shuts down with no problem.
I re-installed Windows 7 (32 bit) it makes no difference same problem occurs.Next thing I will do is to check AC power Out (It supposed to be 15Volts DC-output)