TOSHIBA SATELLITE PRO L300: PSLBDG : PROBLEMS: 1) Restarts automatically when i plug in the power cord. However works fine in Battery. 2) Shuts down when i try to install graphics driver after a clean format with Windoes XP.

Check if the adaptor is working fine. Use a multimeter to check the voltage output from the adaptor.

If the adaptor is working fine, please add a comment to the question.

Toshiba satellite L300 is connectting adapter on turn off machine how problem?

Have you cleaned the fan and vents? Plugged in or Battery? Open Control Panel, Power Options, Set to High Performance, Open Advanced Power Settings, Set Sleep and Hibernate to Never, Adjust advenced settings to your preference.

Many models of Toshiba Satellite laptops have a capacitor called NEC/TOKIN Proadlizer which loses its capacitance with time and hence laptop freezes, shuts down or restarts when AC is plugged in. One needs to replace this cap as shown here:
http://gs138.photobucket.com/groups/q251/S1BXDWUERU/

Try removing the battery and using the power cord to turn on the system. Usually an orange light means a battery problem.

Hi ; the system restart if the power level is incorrect so you should use another AC adapter

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...

Please follow these steps VERY CAREFULLY:

1) Unplug the notebook from the ac adapter (charger power cord)

2) Take off the battery pack on the notebook

3) Once the ac adapter and battery is off the notebook, hold down the power button for 15 seconds

4) After 15 seconds, let go of the power button

5) Now plug in the AC ADAPTER (OR CHARGER POWER CORD) ONLY (DO NOT PUT BACK THE BATTERY PACK)

6) Now press the power button once.

7) If the unit boots, the unit suffered a slight surge

8) If the unit does not boot and remains dead, the unit suffered a severe surge and may be burned out and needs replacing

I hope this helps and let me know how it goes afterwards

it's possible that the battery has failed completely.

try this:

1.take the battery out
2. connect the power cord to adapter and connect adapter to power outlet.

if you get a power light on on your device, attempt restart. if not you may need to either replace the cord that goes from you device to the adapter or your motherboard or the power plug on your motherboard may have failed in which case you may still have to replace accordingly.

have you tried either switching between external and internal monitor usally Fn + F5 on toshiba or try plugging a monitor into the back and see if it displays.
if you get a display on the external monitor then its probably a screen or inverter fault if you donot get a display to an external screen then it is likley t be the graphics on the board itself.
hope this helps