8570w black screen, turning on, but no bios splash screen, no boot

Discussion in 'HP' started by loopster, Sep 13, 2020.

  1. loopster

    loopster Notebook Enthusiast

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    So, I bought an 8570w with a supposedly defective graphics card via ebay a couple of days ago, which I wanted to fix with a an AMD m4000, which I also bought for cheap on ebay previously.
    Upon receiving the laptop, I plugged in the battery, plugged in the charger, turned it on, and hey it worked no problem at all! Wasn't defective after all, or so it seemed.
    It had a k1000M in it, which worked fine. I installed Windows 10 on it, ran a couple of tests, everything hunky dory. I then replaced the Nvidia with the m4000 as an upgrade, replaced the thermal grease and so on, the usual stuff, temps were looking great, did some tests and some casual gaming for a few days.
    Now, today I put the system into standby, which I've never done previously, iirc.
    When I went back to wake it up, I pressed the power button, but the screen remained blank, no backlight, no bios splash, fan is spinning, but no boot or nothing. A plugged in USB keyboard gets power (can see it via LED). I figured that maybe the m4000 had died, so I put back the k1000M, but it's the same beaviour.
    Tried everything so far. Taking out the battery, powering up on AC alone, unplugging the BIOS battery, doing a BIOS reset, BIOS reset via pressing Win+B-Key as suggested by HP, hooking up to an external monitor via VGA, leaving out various RAM modules, the whole lot, but the thing won't POST anymore.
    Sometimes the Caps-lock key stays lit, sometimes it is off, the fuction key LEDs are always on.
    Anyone have an idea what's going on here? Could this behaviour be down to an empty BIOS battery?
    Or do I have a serious problem here? Looks like it. Any tips welcome.

    Edit: Wifi and mute button inciator are red, instead of white as on the browser hotkey and the
    calculator. Don't know whether that means anything, though...
     
    Last edited: Sep 13, 2020
  2. axalt

    axalt Notebook Enthusiast

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    whats the hdd light doing?

    fn+f4 to turn on the display maybe? different power supply? check all the ribbon cables in case you disconnected one.
     
  3. loopster

    loopster Notebook Enthusiast

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    Hdd light is white. Couldn't tell from the SSD in the main bay what was going on, so I put in an HDD.
    It is powered and spins up. The same when I put it inside a SATA-adapter and insert it into the DVD-bay.
    It spins up and the HDD light is on.
    Already tried Fn+F4, it doesn't do anything.
    The ribbon cables don't make any difference, whether connected or disconnected.

    Also doesn't make a difference whether I power up from the battery (0% wear, btw)
    or the AC adapter.
     
    Last edited: Sep 15, 2020
  4. loopster

    loopster Notebook Enthusiast

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    Decided to run the laptop off the battery for a few minutes, then plugged in the AC adaper.
    Battery indicator went white, which according to the service manual means:
    "White: The computer is connected to external power and the battery is charged from 90 to 99
    percent." So, there is still life in this machine, but why is it not coming on?
    Caps-lock key and num-lock briefly blink once upon powering on.
    Dead CPU? Really? How unlikely would that be?
     
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