Posted 05 October 2011 - 11:26 PM
If you have access to a volt-ohm-milliammeter (VOM), check that the power supply is outputting the correct DC voltage to rule out faulty power supply. If power supply is OK then try below.
Disconnect the power cord and remove the laptop battery. Press the power button on the laptop several times, then with the battery out, plug in the power supply and see if it boots.