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Black screen with blinking underscore, unbootable.

Discussion in 'Hardware' started by LeviK, Apr 21, 2016.

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  1. LeviK

    LeviK Thread Starter

    Apr 20, 2016
    First Name:
    This happened in mid-January this year, so I'm going fully based on faded memories and the notes I took down when it happened.

    What I know:
    • BSOD occurred whilst playing a game on Steam, I didn't catch the error-code, as it immediately shut down.
    • Blinking underscore upon next boot
    • Only F12 (Bootup devices) and Del (BIOS) are available, other function keys are not able to proceed to their respective screens.
    • On BIOS; CMOS: A drive is not detected. As in the A-Drive, not a drive.
    What I tried:
    • Try prioritizing bootup devices
    • Resetting BIOS manually
    • Change SATA cable slots, the cable itself, and slots again
    • Tested RAM sticks by removing them one at a time (and switching them to the first slot so the device can recognize properly), none appeared faulty.
    • Tried booting from USB, which gave''invalid partitions''.
    • On BIOS, the Onboard SATA mode is set to Raids, for whatever reason. This is by default and cannot be changed. It is assumed it was set so by the manufacturer, but it was not originally my desktop, and I have no knowledge of it ever being changed from the factory build.
    • ^ To add, the SATA cables have now been swapped to new ones, though identical.
    • PC Health Status: all normal
    • I don't have a clean install or a recovery disk, but the recovery screen isn't available anyway, so I haven't tried to restore to an earlier point either.
    BIOS Extra:
    • System manufacturer: ACER
    • Product name: Aspire M5620
    • MB manufacturer: ACER
    • SMBIOS version: 2.5.0
    • System BIOS version: RO1-A2
    • BIOS released 07/17/07
    Other Specs:
    Found a vague description of factory builds for this model @ http://acersupport.com/acerpanam/desktop/0000/Acer/AspireM5620/AspireM5620sp2.shtml
    • Intel® Core™2 Quad processor
    • Windows Vista Home Premium 32-bit
    If anyone has specific ideas instead of swapping major parts, then they are warmly welcomed. I don't have enough need for a third PC to spend money on the more expensive ones.
    ~ LeviK
  2. LeviK

    LeviK Thread Starter

    Apr 20, 2016
    First Name:
    I take it there are no ideas whatsoever? Bump.
  3. bobs-here


    Mar 12, 2016
    First Name:
    as astarter, using digital camera to capture the BSOD error code on the screen might help.

    after the above narrowing down of the possibilities, overheating needs to be eliminated. this would need specifics of recent changes or overclocking.
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