TROUBLE SHOOTING A COMPLETELY DEAD SYSTEM
If when you plug in the power adapter and press on the power button, there are no signs of life at all. The laptop will not make usual noises, LEDs will not light up, the fan will not spin, the screen is blank and black, etc the laptop is said to be COMPLETELY DEAD.
STEPS FOR TROUBLESHOOTING THIS IS AS FOLLOWS:
1. Make sure that the wall power outlet is working and the laptop DC adapter is getting power from the outlet. Try another wall outlet.
2. Test the laptop DC power adapter; make sure the voltage output is correct. This can be done by testing the DC power adapter with a voltmeter.
3. If the DC adapter is fine and the adapter outputs’ reading is correct, In this case unplug the power adapter from the laptop, remove the battery, wait for 1-2 minutes, plug in the adapter and try turning on the laptop again. If the system runs without the battery, then the battery may be faulty; try replacing it a known working one
If when you plug the DC power adapter and press on the power button, the laptop starts making normal noises, the LEDs work properly but noting appears on the screen. The laptop will not start.


FIG. 01 SHOWING THAT LEDs ARE ON BUT NO IMAGE ON THE SCREEN


First of all, take a closer look at the LCD screen. Look at the screen under bright light. It is may possible that the image is showing on the screen faintly. If that is the case then the problem is most likely going to be back light failure

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