Motherboard (like in most cases it has onboard graphics chip). The motherboard has been removed from the base and I assembled a basic barebone system on my bench.ġ. The last step is testing the laptop as a barebone system. If the computer is still dead, try removing other internal components (wireless card, modem, keyboard, etc…) and test it with an external monitor after each removed part. If external image appears after you disconnected the video cable, apparently there is something wrong with the cable. It’s possible one of them failed and it’s preventing the entire computer from starting up properly.Īlso, try turning on the laptop with an external monitor while the video cable is unplugged from the motherboard. Try turning on the laptop without these components installed. Removing the battery, hard drive, DVD drive and other components you can easily access. If changing or reseating memory doesn’t help, you can try this:
Try moving modules from one slot to another. If you have two modules installed you can try removing them one by one, it’s possible that one of the modules failed. – Try replacing the memory module with another one. – Try moving the memory module into another slot. – Try cleaning contacts on the memory module. – Try reconnecting the memory module, maybe it’s not making good connection with the slot. If both, the internal and external monitors show no image, the problem can be related to: Try reconnecting the video cable on both ends and check out if this helps. – 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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