Member Avatar for Selwyn

HELLO
Nearly every time it turn me pc of for a while it always loads up with cmos checksum - defaults loaded. If i just restart the pc it all loads up fine.
I have replaced the motherboards cmos battery and it still does the same.
Tryed numorous different components inside the pc (hard drive / cd drive / memory) but no difference
The motherboard is an fb52 v1.2 and ive tried to do a bios update , but every site i try to get an update for it has dead links.
Please help me out on this.
Any info would make my day.
Cheers

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Intermittent "CMOS checksum — defaults loaded" messages normally mean the motherboard’s small battery‑backed NVRAM (often called CMOS) has lost its saved BIOS settings between power cycles. Typical causes are a weak/incorrect coin cell, a CMOS‑clear jumper left in or missing, or corrupted BIOS settings. Given 's suggestion to check the jumper and 's follow‑up, a jumper/clear‑pin issue is the most likely root cause in this thread. (lifewire.com)

Why a jumper can produce exactly this symptom: many desktop boards put a three‑pin "CLEAR CMOS" or "CLR PWD" header near the coin cell. When the header is set to the clear position (or incorrectly left open/shorted) the board either resets NVRAM every time or may refuse to power on until the jumper is returned to its default position. Always power down and unplug before touching jumpers. (ibm.com)

A compact checklist to prevent recurrence:

  • Confirm the jumper position against the motherboard manual and return it to the default (don’t leave it in the clear position).
  • Replace a missing jumper with the correct 2‑pin shunt (avoid improvised metal links).
  • If the coin cell is older than ~5 years or time/settings reset, replace it with a CR2032.
  • To deliberately clear CMOS: power off, unplug, move jumper to the clear pins for ~10 seconds (or remove the battery for 1–5 minutes), then restore the jumper and power up; re‑enter date/time and any custom BIOS settings.
    These safe procedures and timings are documented in vendor guides. (intel.com)

If the problem returns after those checks, inspect the board and PSU for failed components (bulging capacitors, unstable rails) and avoid unofficial BIOS flashes from dead links — only use firmware from the board maker or contact their support for the correct update. (howtogeek.com)

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Member Avatar for bobbyraw

on the mother board there should be a jumper to reset the bios. reset the bios then see if the error goes away.

commented: very helpfull +1
Member Avatar for Selwyn

HELLO AGAIN
Thank you bobbyraw
I checked out my mobo and it turns out that the jumper pin was missing on the motherboard.
I have fitted another pin and have rebooted it a few times and it seems to be ok.
Thanks for your help

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