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Laptop does not turn on

Discussion in 'Miscellaneous Hardware' started by umar, Jun 27, 2017.

  1. umar

    umar Owner Administrator

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    When i tried to start my laptop today, nothing happened. I thougt battery needs to be charged, therefore i connected the laptop to power source and tried to start it but nothing happened. Then i removed the battery and connected the laptop to power source directly but same result. When i attach the laptop to power source or battery, power indicator shows white light automatically. Ususally white light shows when battery is full and laptop is on. I try to attach the photo.

    1498551757017646520801.jpg
     
  2. DSTM (Dougie)

    DSTM (Dougie) Super-Moderator Super Moderators

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    Hi umar,
    Try unplugging the charger from the laptop, and remove the battery. With the battery out and the unit unplugged, press and hold the power button for 30 seconds. Then replace battery and plug in charger, turn computer on, and see if it boots.
    What are your specs on the laptop, and what operating system?
     
  3. umar

    umar Owner Administrator

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    I tried as you suggested but problem still persists. When i remove the battery or charger, white light turns off and when i re attach them it turns on automatically.

    Usually when power source is not connected and laptop is turned off, white light does not show but now it is still on even when laptop is turned off.
     
  4. DSTM (Dougie)

    DSTM (Dougie) Super-Moderator Super Moderators

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    Try those instructions a couple more times.
    I am pretty sure your laptop is stuck in "Sleep Mode"
    Keep tapping the "Space Bar"
     
  5. umar

    umar Owner Administrator

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    I tried again. I even tried to press and hold the power button when battery was inserted but laptop is still not turning on. I think battery is not full and power indocator should show either no light or orange light instead of white when lid is closed. There is something odd.
     
  6. Tony D

    Tony D Super-Moderator Super Moderators

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    Well something is going wrong here. Sounds like the laptop is getting power because the light comes on. If you tried Dougie's suggestion to remove all power and hold the power button down to drain any residual power and that didn't work, then try this: Remove the AC adapter and battery. Remove the hard drive. Reconnect power and hopefully, something will appear on the screen. It won't boot into Windows without the hard drive but you should see the manufacturer's logo on the screen.

    If that doesn't work, let's look to RAM. Again remove the AC adapter and battery. Remove the RAM modules. Be careful when removing the RAM modules as they are susceptible to Electrostatic Discharge (ESD). Reapply power and try to start it. Any signs of life?

    What is the make and model of the laptop?
     
  7. Seth Anthony

    Seth Anthony Registered Members

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    Go through the procedure that Dougie mentioned, but this time leave out the battery when trying to power up. Reason being, sometimes a defective battery can lock up the motherboard. Does the power light come on when you have the battery removed and the charger plugged in?

    Also try one ram stick at a time.
     
    Last edited: Jun 27, 2017
  8. DSTM (Dougie)

    DSTM (Dougie) Super-Moderator Super Moderators

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    Both Tony and I have asked for Laptop specs.
    Surely, this information would be on the back of the laptop, or visible when the battery was removed.
     
    Bill likes this.
  9. umar

    umar Owner Administrator

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    Laptop model is hp probook 4540s. I have never opened it before. I try to remove hard drive with the help of some youtube video.

    @seth

    Yes, white light appears when battery is removed and only charger is connected.
     
  10. Seth Anthony

    Seth Anthony Registered Members

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    Have you tried the method that Dougie posted, while leaving the battery out when powering up?

    Trying one stick of ram at a time is a long shot, even more so than the hard drive. Aside from trying those, you're looking at a motherboard failure. Although it's somewhat possible that the AC adapter isn't putting out enough power and the battery is dead.

    Do you hear any sound coming from the laptop? For example the fan or hard drive?
     
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  11. umar

    umar Owner Administrator

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    Ok, i removed both hard drive and memory but same old result. There is only one ram installed. Yes, i checked without battery and connected directly to charger.

    Hard drive matters most. It has all my data. I think i never backed up. I shall check my external hard drive. I have no spare pc.

    What are the ways to retrieve data from an internal hard drive?
     
  12. allheart55 (Cindy E)

    allheart55 (Cindy E) Administrator Administrator

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    You would need access to another computer or a laptop.
    There's an adapter that you can purchase so that you can connect the laptop hard drive, (once removed) to another computer via USB.
     
  13. Rustys

    Rustys Super-Moderator Super Moderators

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  14. allheart55 (Cindy E)

    allheart55 (Cindy E) Administrator Administrator

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    I have the same, just a different manufacturer.
     
  15. umar

    umar Owner Administrator

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    Laptop is silent. No sound.
     
  16. Seth Anthony

    Seth Anthony Registered Members

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    So it looks like a mobo failure. Anyone agree?
     
  17. Tony D

    Tony D Super-Moderator Super Moderators

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    Sounds like it. If it were here, I'd also pull the optical drive (just to make sure it's not pulling anything down). I've never seen it happen, but I like to make sure.
     
  18. umar

    umar Owner Administrator

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    Laptop has optical drive but it no longer works and i created a topic about it here in the past. I shall try to remove it.
     
  19. DSTM (Dougie)

    DSTM (Dougie) Super-Moderator Super Moderators

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    Quite possible, Seth. What I can't get my head around is when the computer was shut down, everything worked, and on next boot up the motherboard is gone. With the motherboard, I would have thought it would have given some early warning signs.
    Suppose anything is possible.
     
  20. Seth Anthony

    Seth Anthony Registered Members

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    In my experience, the mobo is either on or off. Kind of like a light bulb is burnt out or it isn't. There's no in between.

    A weakened component will usually fail at start up, when the components get that initial "shock" of electricity. Kind of like a light bulb almost never fails while it's on, but rather when you turn it on.

    I like light bulbs:)
     
    allheart55 (Cindy E) likes this.

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