Laptop is dead. How to troubleshoot.

posted in: Troubleshooting | 477

In this post I’ll explain how to troubleshoot a dead laptop and find the problem. The following troubleshooting tips are not model and brand specific.

Let’s take a look at different failure scenarios.

Example 1. The computer is absolutely dead. 

When you plug in the AC adapter and press on the power button, there are no signs of life at all. It appears to be dead.

What you can do ?

1. Make sure the wall outlet is working and the AC adapter is getting power from the outlet. Try another wall outlet.
2. Test the AC adapter, make sure the voltage output is correct. You can test the adapter with a voltmeter.
3. If the adapter is good, try reconnecting the battery. Remove the battery, wait for 1-2 minutes, plug in the adapter and try turning it on again.

If the adapter doesn’t pass the test with a voltmeter, replace it with a new one and test the computer. I always recommend buying an original replacement adapter from the manufacturer, not a generic one.

There could be more than one adapter available for your model.
The voltage output on your new adapter must be exactly the same as on the old one. The amperage, on the other hand, can be the same or higher.

If previous troubleshooting steps didn’t help, it’s possible your computer has a problem with the motherboard or DC power jack. In this case it’s necessary to disassemble the laptop and test the DC jack.

Example 2. The computer turns on and makes normal startup noises, the LED lights turn on but noting appears on the screen.

Troubleshoot dead laptop

First of all, take a closer look at the screen under bright light. It’s possible the screen shows the image but it’s very faint. In this case you’ll have to troubleshoot the backlight failure.

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.

You can toggle video output between internal and external modes by using Fn keys:
- Fn and F4 keys simultaneously on HP laptops
- Fn and F5 keys on Toshiba laptops
- Fn and F7 keys on IBM laptops.
Other laptops may use different key combinations.

Connect external monitor

If the external monitor works fine but the internal screen has no image at all, the problem can be related to:

- Poor connection between the video cable and screen or motherboard. Try reconnecting the video cable on both ends and check out if this helps.
- The screen failed. Replace it with a new one.
- The video cable failed. Replace it with a new one.
- The motherboard failed.

Test external video

If both, the internal and external monitors show no image, the problem can be related to:

- Failed memory (RAM).
- Failed motherboard.

Replace reseat memory module

- Try reconnecting the memory module, maybe it’s not making good connection with the slot.
- Try cleaning contacts on the memory module.
- Try moving the memory module into another slot.
- Try replacing the memory module with another one.

If you have two modules installed you can try removing them one by one, it’s possible that one of the modules failed. Try moving modules from one slot to another.

If changing or reseating memory doesn’t help, you can try this:
Removing the battery, hard drive, DVD drive and other components you can easily access. Try turning on the laptop without these components installed.

It’s possible one of them failed and it’s preventing the entire computer from starting up properly.

Remove hard drive DVD drive

Also, try turning on the laptop with an external monitor while the video cable is unplugged from the motherboard.

If external image appears after you disconnected the video cable, apparently there is something wrong with the cable. Replace it with a new one.

Disconnect display

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.

Remove laptop components

The last step is testing the laptop as a barebone system.

Test laptop motherboard

On this picture you see my final test. The motherboard has been removed from the base and I assembled a basic barebone system on my bench.

The bare bone system includes:
1. Motherboard (like in most cases it has onboard graphics chip).
2. CPU with the cooling module.
3. Known good memory module.
4. The power button board.
5. Known good AC adapter.

If the system still doesn’t turn on, it’s either bad motherboard or failed CPU.

If you computer shows garbled or distorted image, check out this post.

477 Responses

  1. Agent_Yellow #26

    hi i have a hp laptop it wont turn on the last thing i did is i break the round metal at my charger, I brought it to a Service Center and they say that the problem is the “ic” of the laptop and they can’t fix me please. TIA :)

  2. judel

    i have a acer aspire it has a power but no display the mother board heats up but the hdd didnt work but i tried to put on other laptop the hdd works fine what should i do

  3. cj2600

    @ cielo,
    Can you tell what is wrong with the laptop? How it’s failing?
    Do you see any light when AC adapter plugged in? Does it turn on at all?

  4. hi i have a dead laptop it is HP pavilion 6500t please help me to fix my problem for my laptop. thanks

  5. priyanka

    my hcl laptop is not glow the power led light, but laptop is working. what is the reason for not glowing light. then, just lightly shake the laptop, suddenly turnoff the laptop. tell me these qustions

  6. @ Tulio,
    This model has a know issue with the video card card.
    Disconnect the battery, remove the hard drive and optical drive. After that test the laptop with only one RAM module installed. Try different RAM.
    If nothing helps, probably this is motherboard related failure.

  7. In my case (i have a dv6000) when i plug the power adapter, the light in the power connector and the charging led both turn on, and when i press the power button, there is no usual noises just all the leds turn on and then off and go back to the power connector light and charging led on and thats it. Thanks l

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