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Laptop will not boot - lights come on less than one second

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Laptop will not boot - lights come on less than one second

joestar7
Hi,

My HP laptop will not boot. The lights come on for less than a second and then off. Removed battery, reseated ram. Please advise.

Thanks,
Joe
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    Fregeus

    If you remove battery and plug in power supply, does it work?


    TCB

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    robo_dev

    from the system (hard drive, CD-ROM, Ram, modem, wlan, etc). This is only to identify if a shorted or faulty component is causing the system to fail self-test. The hard drive would be the most likely part, since it draws the most power.

    Reset the bios, if possible.

    Inspect the power supply connection for signs of damage, looseness, etc.

    Also try powering up with external video connected, and lid shut, in case a shorted video display component is causing the non-start.

    If the system will not stay powered up with a known good power supply, then it's the system board.

    The system has a two-step power up cycle. It does a quick self-test before applying full current to the motherboard and display circuitry. If the self-test fails, the soft power-on circuitry will not continue.

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    rjluvkc

    Use a volt meter and check the adapter to ensure it is putting out the appropriate dc voltage. If you have an extra one, try that.
    I suspect that first. Hope this helps.

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    joestar7

    Hi,

    I think this is probably a mobo or electrical problem and not worth cost of repair.

    Thanks for the help,

    Joe

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    rjluvkc

    Did you test the adapter? If that is indeed the issue, a new one shouldn't cost that much.

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    OH Smeg

    When the Mains Adapter starts to go off it doesn't provide enough voltage and as a result the battery goes flat.

    When you have a flat battery and a nonworking Mains Adapter the symptoms that you are describing is exactly what happens because there isn't enough charge in the battery to support running the system or even starting it.

    I would suggest trying a different mains adapter first before trashing the NB.

    Col

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    0 Votes
    Fregeus

    If you remove battery and plug in power supply, does it work?


    TCB

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    0 Votes
    robo_dev

    from the system (hard drive, CD-ROM, Ram, modem, wlan, etc). This is only to identify if a shorted or faulty component is causing the system to fail self-test. The hard drive would be the most likely part, since it draws the most power.

    Reset the bios, if possible.

    Inspect the power supply connection for signs of damage, looseness, etc.

    Also try powering up with external video connected, and lid shut, in case a shorted video display component is causing the non-start.

    If the system will not stay powered up with a known good power supply, then it's the system board.

    The system has a two-step power up cycle. It does a quick self-test before applying full current to the motherboard and display circuitry. If the self-test fails, the soft power-on circuitry will not continue.

    +
    0 Votes
    rjluvkc

    Use a volt meter and check the adapter to ensure it is putting out the appropriate dc voltage. If you have an extra one, try that.
    I suspect that first. Hope this helps.

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    0 Votes
    joestar7

    Hi,

    I think this is probably a mobo or electrical problem and not worth cost of repair.

    Thanks for the help,

    Joe

    +
    0 Votes
    rjluvkc

    Did you test the adapter? If that is indeed the issue, a new one shouldn't cost that much.

    +
    0 Votes
    OH Smeg

    When the Mains Adapter starts to go off it doesn't provide enough voltage and as a result the battery goes flat.

    When you have a flat battery and a nonworking Mains Adapter the symptoms that you are describing is exactly what happens because there isn't enough charge in the battery to support running the system or even starting it.

    I would suggest trying a different mains adapter first before trashing the NB.

    Col