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CMOS battery/BIOS problem

Discussion in 'Hardware' started by tenbels, Jan 18, 2012.

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  1. tenbels

    tenbels Thread Starter

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    Jan 18, 2012
    Messages:
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    I've seen a few problems like mine on the boards but never a satisfactory resolution. My problem started with a frozen screen. I did have a few windows open and i was listening to music and surfing at the time. Upon restart case light came on, M/B power light came on, fans on psu, cpu and graphics card all spun up as well as hard drive, but no post beep. Long story short is that I have done everything recommended on various forums, like resetting the Cmos via the jumpers, taking out the CMOS battery, leaving the CMOS battery out overnight, new CMOS battery, changing the PSU etc. and am now at the stage where I have the M/B stripped out of the case on the workbench with just the psu, one stick of memory, Graphics card, Hard drive, mouse and keyboard. Strange thing is computer WILL post with default Bios settings when CMOS battery removed, go through bios setup routine, launch Windows and run perfectly normally. But as soon as I put the battery back, nothing, no post beep, nothing, just spinning fans and no display. Has the Bios Chip got corrupted? The battery clip does look firmly soldered to the M/B and is not bent. I am at a loss. Can't RMA the M/B as its an Ebay job. All the Caps look sound. Is it worth replacing the BIOS chip as they're fairly cheap or is the M/B toast?? Does anyone know anything elseI can try??

    System is:

    Motherboard: ASUS A8N-E
    Bios: Phoenix Tech. Ltd AWARD BIOS ACPI rev.1013
    PSU: CIT 750W ATX Power Supply
    CPU: Athlon64 3500+
    Graphics Card: Radeon HD4670
    Hard drive: 750GB WD Caviar Green
    OS: Windows XP Pro Service Pack 3
     
  2. leroys1000

    leroys1000 Banned

    Joined:
    Aug 15, 2007
    Messages:
    6,319
    Double check and make sure the cmos clear jumper is in
    the run/normal position.
    Leaving it in the clear position can cause no boot.
     
  3. tenbels

    tenbels Thread Starter

    Joined:
    Jan 18, 2012
    Messages:
    3
    Hi leroys1000, jumper is O.K. Its just as I say, you take the battery out computer boots and runs fine, albeit with default BIOS settings but as soon as battery is put back. . .nothing!
     
  4. crjdriver

    crjdriver Moderator

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    Jan 2, 2001
    Messages:
    37,449
    I would put money on a failing board. Those boards are going on 6+ yrs old now. Have you checked the board carefully for any leaking capacitors?
     
  5. tenbels

    tenbels Thread Starter

    Joined:
    Jan 18, 2012
    Messages:
    3
    Hi crjdriver, Yup, checked the board thoroughly for bloaty/leaky capacitors and all of 'em look sound. Surely a dodgy cap wouldn't explain why the computer boots and runs completely normally without the battery tho'? One thing as well, it won't reboot once running, you have to shut down completely and start from scratch.
     
  6. crjdriver

    crjdriver Moderator

    Joined:
    Jan 2, 2001
    Messages:
    37,449
    Bad caps can cause all types of problems; depending on where they are located. A board should boot without a cmos battery however when doing so, it also gives errors. When you install the battery, I would assume another part of the board becomes active [possibly with a bad cap or failed VR]

    In any case, that board is very old by modern standards and it is not worth putting any money into that old of a system.
     
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