Thank you, I have the same problem with a Toshiba Satellite A200 PSAF0A-02L01C laptop. Problem fixed without replacing the faulty NEC/TOKIN Proadlizer Capacitor. If you want to replace the faulty capacitor a reference is here: http://forums.toshiba.com/t5/Batteries-and-Power/satellite-m200-power-problem/td-p/40572/page/8 and http://www.laptoprepairblog.net/toshiba-satellite-l300-a300-freezing-or-restarting-when-ac-power-plugged-in Changed the Power Saver to High Performance in Windows 8.1 and problem fixed. In addition one of the two CPU cores may be disabled in the BIOS setup if having problems after changing the power mode. You may have to initially disable one of the processor cores in BIOS to get the laptop to boot up past the Power-on self-test (POST). The laptop is always used on AC mains power as the battery has reached the end of it's life. Therefore being on the High Performance power setting is not a problem as extending battery life is not important.