Abit NF7 Motherboard with AMD Athlon XP 2500+ CPU (Ambulance Sound when I turn on)
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  1. #1
    Join Date
    Oct 1999
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    Los Angeles,CA,USA
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    927

    Abit NF7 Motherboard with AMD Athlon XP 2500+ CPU (Ambulance Sound when I turn on)

    I have this Computer that contains an Abit NF7 Motherboard with an AMD Athlon XP 2500+ CPU. The computer was working fine, but I removed the power chord and when I tried turning it back on, the bios were not saved. This has happened in the pass because I believe the CMOS battery is not working. In the pass, I just changed the bios settings and everything worked fine.

    Well, this time around when I tried changing the CPU FSB/DRAM Ratio to 5/6 to get 400 MHz, it was giving me 240 MHz.

    When I tried turning back the computer, it gives me a sound similar to that of an "ambulance", then it turns off. I removed the cpu fan and it looks like the attached picture. Not sure if this is the problem, but it had been working fine for awhile.

    Appreciate, if you guys/girls can give me some advice on what might be wrong.

    Thanks
    1.jpg2.jpg

  2. #2
    Join Date
    Feb 2011
    Posts
    354
    Whenever the heatsink is removed from a CPU, new thermal grease needs to be applied.

    Instructions
    Doc

    ____________http://www.microsoft.com/security____________
    \____________________ ____.-.____ ____________________/
    \_____________\ -._)!(_.- /_____________/
    \_______\. ~\ /~ ./_______/
    \_______/

  3. #3
    Join Date
    Aug 2000
    Location
    Quebec, Canada
    Posts
    2,778
    Have you tried measuring the CMOS battery voltage to see if it's still good ?
    I had a motherboard from a similar era starting to have problems at POST (forgotten CMOS settings, failed overclock messages, bad checksums).
    It got worse when I unplugged it as it leans on that battery when the power is cut.
    Changing the battery solved the problem.

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  4. #4
    Join Date
    Feb 2011
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    The most common CMOS battery on Desktop PC motherboards is a "CR2032". They usually run a couple of bucks or so at almost anywhere that sells batteries. I've seen them at CVS, Home Depot, K-Mart, Lowe's, Office Depot, Office Max, Radio Shack, Rite-Aid, Sears, Target, Walgreens, Wal-Mart, and so on.
    Doc

    ____________http://www.microsoft.com/security____________
    \____________________ ____.-.____ ____________________/
    \_____________\ -._)!(_.- /_____________/
    \_______\. ~\ /~ ./_______/
    \_______/

  5. #5
    Join Date
    Mar 2000
    Posts
    27,266
    No CMOS battery = No CMOS/BIOS settings saved. No if's but's or why's... It worked partially in the past because CMOS battery was not completely dead. As others already hinted, if intent on using mobo, try with a verified working CMOS battery.
    With that stated,
    Check the mobo for bad caps. That mobo was manufactured during the time period of Capacitor plague.
    "I know nothing."
    Cheers.

  6. #6
    Join Date
    Oct 1999
    Location
    Los Angeles,CA,USA
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    927
    Thanks for your help, got the computer working. Checked the capacitors and they all looked in good shape. Checked the battery and it was not working. Replaced the battery and put the thermal paste and the computer is back on. THANKS.

  7. #7
    Join Date
    Feb 2011
    Posts
    354
    Excellent news! Thanks for letting us know.
    Doc

    ____________http://www.microsoft.com/security____________
    \____________________ ____.-.____ ____________________/
    \_____________\ -._)!(_.- /_____________/
    \_______\. ~\ /~ ./_______/
    \_______/

  8. #8
    Join Date
    Aug 1999
    Location
    New York, NY
    Posts
    5,975
    Awesome!
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