Toshiba Satellite Pro A300 model number PSAGDA-00K-00R
The power adapter needs to be checked or better still sub out with a second power supply.
SOURCE: Toshiba Satellite L300 shuts down when ac power plugged in
How about this step, try to turn off the laptop itself. Remove the cables and battery just like what you did before, then press and hold the power button for 10 seconds. Then, reinsert the cables and battery on the laptop and then turn on the computer itself. If the laptop restarts, shuts down or freezes with the AC power cables, two things that you should seriously consider. It might be the power cable itself, AC cable port or the circuitry going to the motherboard. And since you have cleaned out the fan and heat sink, you have isolated that problem. Have you plug-in another power cable on your laptop? If yes, then check if it works. Otherwise, the main issue is that the AC port is loose or the circuitry of AC adapter going to the motherboard is not not working. You can re-open the unit and check the circuitry from the AC port going to the motherboard. You may check the circuitry from AC port to the power supply if it is ok. If symptom persist, please contact your local dealer...
SOURCE: HOW TO ENABLE TOUCHPAD ON TOSHIBA SATELLITE PRO M15-S405
Press the Fn and F9 keys, that should turn it back on. Let us know if that solve your issue and please dont' forget to rate this posting.
SOURCE: toshiba satellite pro m15 s405 video card replacement
The video card is replaceable and is relatively simple for those comfortable with laptop disassembly.
SOURCE: ReplaceToshiba Satellite Pro 6100 laptop CMOS battery
the cmos batt is located near the cpu, is a quarter look alike batt. disconect it fron the two cable connector to the mb and replac e with a new one.
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