The output voltage must be exactly the same as on the original adapter. If you have to replace the AC adapter, make sure you use a correct one.
If you know that the AC adapter is working properly and it outputs correct voltage but the laptop is still dead, most likely you have a power issue on the motherboard (or power board on some laptops) and it has to be replaced. It is possible the laptop appears to be dead because the AC adapter is bad (and the battery is discharged). If you cannot do that, find a known good AC adapter and use it for testing the laptop. You can test the output voltage with a voltmeter.
You plug the AC adapter but the LEDs (power light, hard drive light, battery charge light, etc…) do not light up and the laptop will not react at all if you press on the power button.įirst of all in this situation check the AC adapter.
