Corrupted NVRAM data stopped Windows 7 boot and BIOS access

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia
    #1

    Corrupted NVRAM data stopped Windows 7 boot and BIOS access

    A few days ago, a client of mine had a computer which kept displaying a blue screen when booting into Windows 7, and the USB keyboard was not working.
    Since the motherboard had PS/2 ports, they worked, but I still could not get access to the BIOS.
    So I tried using the Clear CMOS jumper which fixed this problem (the USB keyboard worked after all) and after fixing up the BIOS settings, the system booted with no problem.

    This client said that a surge got in and only took out a surge protector connected to their computer - I think some noise got through the 5V standby supply and corrupted the NVRAM, which disabled the USB ports and access to the BIOS menus.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
    Tags: None
    • goontron
      5000!
      • Dec 2011
      • 4108
      • US
      #2
      Re: Corrupted NVRAM data stopped Windows 7 boot and BIOS access

      did you check the caps in the PSU? If the caps are bad on the 5vSB it would let any noise by and result in bad output voltage too. which could cause the NVRAM to go corrupt.
      Things I've fixed: anything from semis to crappy Chinese $2 radios, and now an IoT Dildo....

      "Dude, this is Wyoming, i hopped on and sent 'er. No fucking around." -- Me

      Excuse me while i do something dangerous


      You must have a sad, sad boring life if you hate on people harmlessly enjoying life with an animal costume.

      Sometimes you need to break shit to fix it.... Thats why my lawnmower doesn't have a deadman switch or engine brake anymore

      Follow the white rabbit.

        Comment

        • japlytic
          Badcaps Legend
          • Oct 2005
          • 2086
          • Australia
          #3
          Re: Corrupted NVRAM data stopped Windows 7 boot and BIOS access

          The system was built 6 months ago with a new power supply.
          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

            Comment

            • Uranium-235
              Comrade Glimmer
              • Aug 2007
              • 5045
              • US
              #4
              Re: Corrupted NVRAM data stopped Windows 7 boot and BIOS access

              Originally posted by japlytic
              The system was built 6 months ago with a new power supply.
              that doesn't invalidate goon's statement
              Cap Datasheet Depot: http://www.paullinebarger.net/DS/
              ^If you have datasheets not listed PM me

                Comment

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