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    P-7811FX won't boot/black screen

    Discussion in 'Gateway and eMachines' started by myztikgohan, Mar 11, 2011.

  1. myztikgohan

    myztikgohan Notebook Consultant

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    When I turn it on the power button and media buttons light up but I just get a black screen. The laptop then shuts down and restarts by itself and all I get is a black screen. Holding down the power button and hooking up to an external monitor didn't work.
     
    myztikgohan, Mar 11, 2011
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  2. TANWare

    TANWare Just This Side of Senile, I think. Super Moderator

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    could be the GPU, also could be power brick, battery, memory, cpu or a host of other issues. By default do you overclock the GPU and are there any upgrades? Usually the GPU alone will not cause a reboot cycle.
     
    TANWare, Mar 11, 2011
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  3. myztikgohan

    myztikgohan Notebook Consultant

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    No upgrades/overlocking. It only restarts once.
     
    myztikgohan, Mar 11, 2011
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  4. TreeTops Ranch

    TreeTops Ranch Notebook Deity

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    Just had that happen on my P7805U after trying to install the Win7 64 Service pack #1.

    Would not boot just a black screen. So I took the computer downstairs to the tv to hook up a hdmi cable to see if a external display would work.

    Guess what. The computer booted and both screens worked.

    So try to unplug the power source if using the brick. If on battery, remove it and reinsert and try again.

    Post back if that worked for you.
     
    TreeTops Ranch, Mar 11, 2011
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  5. myztikgohan

    myztikgohan Notebook Consultant

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    I don't have a HDMI cable. I can hook the laptop up to the TV but nothing changes and both have black screens.
     
    myztikgohan, Mar 11, 2011
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  6. myztikgohan

    myztikgohan Notebook Consultant

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    Plugged in - black screen
    Plugged in + battery - black screen
    Battery - black screen
     
    myztikgohan, Mar 11, 2011
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  7. myztikgohan

    myztikgohan Notebook Consultant

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    Actually I think my battery is dead and it's not being recharged.
     
    myztikgohan, Mar 11, 2011
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  8. myztikgohan

    myztikgohan Notebook Consultant

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    So
    Plugged in: power LED on, black screen
    Plugged in + battery: battery LED and power LED on, black screen
    Battery: black screen for 3 seconds then shut down
     
    myztikgohan, Mar 11, 2011
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  9. TANWare

    TANWare Just This Side of Senile, I think. Super Moderator

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    if it is dead and no recharge the power brick could be bad somewhere or the internal power board. check all connections and wires etc. does the led on the brick come on when plugged in fresh under no load and once you plug it into the laptop and turn the laptop on does the led on the brick stay on?
     
    TANWare, Mar 11, 2011
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  10. myztikgohan

    myztikgohan Notebook Consultant

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    The LED comes on with no load and connected to the laptop. It takes about 10 seconds for the LED to fade when I unplug the brick completely if that matters.
     
    myztikgohan, Mar 11, 2011
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  11. myztikgohan

    myztikgohan Notebook Consultant

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    I'm thinking it's the motherboard, because if I hold the power button for 10-30 seconds and it does that power reset or whatever, my laptop will start, shut down, then restart and stay on a black screen. Then if I shut it down and then start it manually it doesn't restart itself and just stays on the black screen. So maybe it's not getting power correctly or something. Even removing the harddrives it doesn't seem to be getting into BIOS at all.
     
    myztikgohan, Mar 11, 2011
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  12. myztikgohan

    myztikgohan Notebook Consultant

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    Went to Best Buy and they said the power brick was working fine. My mother says it isn't the motherboard because the power/media button lights stay on, but the capslock/scroll/nump and wireless ones don't, and I don't know how else to explain the laptop restarting itself.
     
    myztikgohan, Mar 11, 2011
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  13. myztikgohan

    myztikgohan Notebook Consultant

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    On the motherboard side where the GPU cooler is there seems to be a little patch where it looks like there's dried cinnamon or something. I can kinda of scratch it off but I don't know if that is actually a paste or something that should be on there. Maybe it's solder?
     
    myztikgohan, Mar 11, 2011
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  14. myztikgohan

    myztikgohan Notebook Consultant

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    Well cleaning it did nothing, whatever it was.
     
    myztikgohan, Mar 12, 2011
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  15. JRSOR

    JRSOR Notebook Consultant

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    Sounds like bad solder on the gpu.
     
    JRSOR, Mar 12, 2011
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  16. myztikgohan

    myztikgohan Notebook Consultant

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    Where can I buy another motherboard for a P-7811FX?
     
    myztikgohan, Mar 12, 2011
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  17. JRSOR

    JRSOR Notebook Consultant

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    JRSOR, Mar 12, 2011
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  18. myztikgohan

    myztikgohan Notebook Consultant

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    myztikgohan, Mar 13, 2011
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  19. myztikgohan

    myztikgohan Notebook Consultant

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    Fixed it! Reset the CMOS!
     
    myztikgohan, Mar 14, 2011
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  20. TANWare

    TANWare Just This Side of Senile, I think. Super Moderator

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    good to hear which method did you use, removing the battery plug or catching it just right before DST post?................
     
    TANWare, Mar 14, 2011
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