Strange problem with ProBook 4540s

Discussion in 'PC Hardware' started by maxb2000, Dec 13, 2018.

  1. maxb2000

    maxb2000 MDL Member

    Aug 5, 2012
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    Hi,

    I have a very strange problem with my HP ProBook 4540s so ANY help is appreciated:

    Press the Power button, the power LED turns on for like 1.5 seconds (including the caps lock, AC LED and also fan, the display doesn't turn on) and then turn off and then he tries to startup again and sometimes it does show the HP screen and boots normally sometimes doesn't and turns off and then on for 1.5 seconds and so on and on...

    I tried:

    - Reflash the latest version version of BIOS
    - Rollback of BIOS doesn't work (invalid signature file says when I try to flash the BIOS but I tried different versions but same problem) and I still have no solution for this to work.
    - Take out SSD.
    - Take out the RAM, I tried switching the slots but has no effects.
    - I tried reset the BIOS via taking out the CMOS battery. I even replaced the battery and nothing.

    The problem is present no matter if I am on battery or AC power.

    It happens randomly, sometimes it boots up on second try sometimes on first try sometimes at all.

    I hope that I explained the problem good enough, If you have questions please ask me because this problem is driving me nuts !!!
     
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  2. Sajjo

    Sajjo MDL Addicted

    Feb 6, 2018
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    One or two RAM chips?
     
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  3. maxb2000

    maxb2000 MDL Member

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    I have 2 RAM sticks but I tried with every one of them and both, sometimes boots sometimes not.
     
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  4. Sajjo

    Sajjo MDL Addicted

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    Problems like this can be a needle in haystack sometimes.
    One thing first, you successfully flashed with latest bios from HP? If yes we could probably rule that out of the Equation
     
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  5. maxb2000

    maxb2000 MDL Member

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    Yes, the flash was successful. The rollback doesn't work.
     
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  6. Sajjo

    Sajjo MDL Addicted

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    That would most likely be a security feature in your BIOS.
     
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  7. maxb2000

    maxb2000 MDL Member

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    Yes, but in HP UEFI Diagnostic Tools I have an option called rollback BIOS that's what I used but like I said doesn't work. Why HP put an option that doesn't work is beyond me
     
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  8. coleoptere2007

    coleoptere2007 MDL Guru

    Apr 8, 2008
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    Try reseting the bios by default
     
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  9. maxb2000

    maxb2000 MDL Member

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    I tried that too.
     
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  10. Sajjo

    Sajjo MDL Addicted

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    Just an example
    I´m on a ASUS ROG and I have to run ASUS own WinFlash.exe scripted: <start "" "C:\Program Files (x86)\ASUS\WinFlash\WinFlash.exe" /nodate> to rollback BIOS flashing. Does HP have a similar way to do it?

    If you strip everything out of your pc - RAM, SSD etc, do you get any POST messages at all?
     
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  11. maxb2000

    maxb2000 MDL Member

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    On HP you have a couple of ways to flash the BIOS:

    Via HP Utility which installs the BIOS required files to the EFI partition of the HDD and then the BIOS detects those files on restart and flash them.

    Or you enter into the BIOS the select the file manually.

    Or via HP UEFI Diagnostic Tools where you have 2 options update or rollback the bios. Both options work if you try to flash the current version of BIOS or a larger one but a previous version doesn't work at all.

    There is no Windows bios update utility unfortunately.

    I tried all of them and like I said works only for the current version of BIOS
     
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  12. maxb2000

    maxb2000 MDL Member

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    I get a blinking LED of the caps lock button if I take out the RAM and everything else except the CPU
     
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  13. macnavarra

    macnavarra MDL Member

    Nov 13, 2017
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    Keep in mind if you upgraded the memory to +/- 8GB max for you´re Laptop in dual channel the two so-dimms must be of 4GB each and same speed etc .. in single channel I guess 4GB is max by the bios.
     
  14. maxb2000

    maxb2000 MDL Member

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    I have 8 GB in total. I got this problem with random startup from like 2 months ago. I have 8 GB of RAM from like 2015. So the RAM isn't the problem here. I did test it and seems fine
     
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  15. Sajjo

    Sajjo MDL Addicted

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    Ok, thanks. Let me think on it for a while.
    In the meantime maybe someone else like to chime in :)
     
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  16. Sajjo

    Sajjo MDL Addicted

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  17. maxb2000

    maxb2000 MDL Member

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  18. Sajjo

    Sajjo MDL Addicted

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  19. Sajjo

    Sajjo MDL Addicted

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