– Poor connection between the video cable and screen or motherboard. If the external monitor works fine but the internal screen has no image at all, the problem can be related to: Other laptops may use different key combinations. – Fn and F4 keys simultaneously on HP laptops You can toggle video output between internal and external modes by using Fn keys: On the other hand, if the screen shows no image at all, test the laptop with an external monitor (or TV) connected to the VGA port or DVI port or HDMI port. In this case you’ll have to troubleshoot the backlight failure. It’s possible the screen shows the image but it’s very faint. The computer turns on and makes normal startup noises, the LED lights turn on but noting appears on the screen.įirst of all, take a closer look at the screen under bright light. In this case it’s necessary to disassemble the laptop and test the DC jack.Įxample 2. If previous troubleshooting steps didn’t help, it’s possible your computer has a problem with the motherboard or DC power jack. The amperage, on the other hand, can be the same or higher. The voltage output on your new adapter must be exactly the same as on the old one. There could be more than one adapter available for your model. I always recommend buying an original replacement adapter from the manufacturer, not a generic one.
If the adapter doesn’t pass the test with a voltmeter, replace it with a new one and test the computer. Remove the battery, wait for 1-2 minutes, plug in the adapter and try turning it on again. If the adapter is good, try reconnecting the battery. You can test the adapter with a voltmeter.ģ. Test the AC adapter, make sure the voltage output is correct. Make sure the wall outlet is working and the AC adapter is getting power from the outlet. When you plug in the AC adapter and press on the power button, there are no signs of life at all.
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