Question about Abit AI7 Motherboard

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Two tone Siren from MoBo/over heating CPU

I was recently given a custom built computer from a friend who was moving out of town.

380w antec psu
Abit AI7
Pentium 4 3.0ghz
2x 256mb + 512mb RAM
radien 9800 pro
5.1 soundblaster sound card

I'm now trying to get this computer to work. For the most part everything seems to work fine except that there is a continuous two tone siren coming from the Abit AI7 motherboard that starts as soon as I power on.

After some googling I found that "A two-tone siren, generally caused by overheating or out of specification voltages". I have a general understanding of what this means but not sure what to do.

Currently the symptoms I'm experiencing are (that I am aware of are)
1. two tone siren
2. CPU overheating up to 80C or higher if I dont shut down, and thats just sitting in bios page, not even booted into any OS.

At this point I should mention that visually all the fans (cpu, psu, northbridge, large case fan, and video card fan) appear to be running normally and that I've already tried resetting the BIOS to its factory fail safe defaults. I've also removed the RAM and tried different sticks in different slots.

I googled pretty heavily to find problems similar to mine but with no success, I'm not very experinced in trouble shooting hardware and I've never built a computer before so Im kind of stuck here.

My guess is that the CPU is over clocked through jumpers on the motherboard but I'm not sure how to change those. Also the link to my motherboard's manual on the Abit site is broken (lucky me)

I would greatly appreciate any suggestions.

Posted by on

  • ninjafish87 Jan 20, 2009

    Upon closer inspection I realized that the cpu heatsink was completely encased in dust, to the point where the fan on top of it was not getting any air to it at all. So after blowing out all that dust cpu temperature went back to normal and no longer overheating.

    Also I now know that the voltage control on this motherboard is done through the bios and not through jumpers, the settings on the bios are all correct and the cpu voltage is currently at the lowest possible option.

    So I've ruled out cpu overheating, I'm begining to think its the PSU it is about 4 years old


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At first go to the bios. then default the bios setting. then check the system monitor. if the cpu is too hot you can see it. or you can change the processor. never over clock the processor.

Posted on Jan 20, 2009

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