Common laptop faults: laptop service center in omr Power on problem. Even with the AC adapter plugged in there is no led turned on, and when you press the power button nothing happens, the laptop doesn't show any sign of life. Reasons for power on problem 1-The Ac adapter is broken and there is no charge left in the battery, test the AC adapter with a multimeter set as voltmeter and by placing the red probe inside the hole and the black probe outside. If you don't read 19 V change the AC adapter. 2- The DC jack is broken and the laptop doesn't receive any power from the AC adapter, replace it and try again. 3- The last possible reason is that you have a motherboard issue and precisely with the charger circuit, laptop service center in omr Blank screen. When you press the power button power LED lights up, the cooling fan works but nothing appears on the screen, the screen is black and nothing is displayed. Possible reasons: ...