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#1
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Fooling motherboard into booting without CPU fan
Hi,
Is it possible to fool a motherboard into booting even without the fan attached (assuming it checks the rotational speed before proceeding)? I thought shorting the 'SENSOR' and 'GROUND' pins would work at first, but if it's being used to detect the fan speed, then maybe not? The CPU_FAN connector on the Gigabyte motherboard has 3 pins (SENSOR, 12V and GROUND), if that's relevant(?). Any help would be appreciated, thanks! - Michael Strorm |
#2
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Michael Strorm wrote:
Hi, Is it possible to fool a motherboard into booting even without the fan attached (assuming it checks the rotational speed before proceeding)? I thought shorting the 'SENSOR' and 'GROUND' pins would work at first, but if it's being used to detect the fan speed, then maybe not? The CPU_FAN connector on the Gigabyte motherboard has 3 pins (SENSOR, 12V and GROUND), if that's relevant(?). Any help would be appreciated, thanks! You should be able to go into the BIOS and disable the CPU fan check. I do this, as my CPU fan is 2-wire. -WD |
#3
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use a 1.5v battery between the 3rd pin and ground. My 4000RPM fans run
around 1.7 volts.on the tach side. "Michael Strorm" wrote in message om... Hi, Is it possible to fool a motherboard into booting even without the fan attached (assuming it checks the rotational speed before proceeding)? I thought shorting the 'SENSOR' and 'GROUND' pins would work at first, but if it's being used to detect the fan speed, then maybe not? The CPU_FAN connector on the Gigabyte motherboard has 3 pins (SENSOR, 12V and GROUND), if that's relevant(?). Any help would be appreciated, thanks! - Michael Strorm |
#4
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On Mon, 06 Oct 2003 00:03:36 GMT, "jpsga" wrote:
use a 1.5v battery between the 3rd pin and ground. My 4000RPM fans run around 1.7 volts.on the tach side. That sounds like a bad idea, it is not a voltage level being detected from the fan, it's the pulse rate. Neither should the sense pin be grounded. The poster who mentioned a bios setting to disable the fan error-stop was correct. Dave |
#5
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kony wrote in message . ..
On Mon, 06 Oct 2003 00:03:36 GMT, "jpsga" wrote: use a 1.5v battery between the 3rd pin and ground. My 4000RPM fans run around 1.7 volts.on the tach side. That sounds like a bad idea, it is not a voltage level being detected from the fan, it's the pulse rate. Yeah, that's what I suspected... :-( Neither should the sense pin be grounded. The poster who mentioned a bios setting to disable the fan error-stop was correct. Good idea, but the power to the machine cuts out after a fraction of a second, so it's not an option. Given that (supposedly) an Athlon without the heatsink can fry in under a second(!!), this is not surprising, but it does mean I can't do anything with the BIOS. - Michael S |
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#7
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Michael Strorm wrote:
Hi, Is it possible to fool a motherboard into booting even without the fan attached (assuming it checks the rotational speed before proceeding)? I thought shorting the 'SENSOR' and 'GROUND' pins would work at first, but if it's being used to detect the fan speed, then maybe not? The CPU_FAN connector on the Gigabyte motherboard has 3 pins (SENSOR, 12V and GROUND), if that's relevant(?). Any help would be appreciated, thanks! - Michael Strorm You can turn the protection off in the BIOS, where it's labelled Guardian Function. You'll just need something connected enough to get it to the BIOS. |
#8
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Barry Walsh wrote:
Michael Strorm wrote: Hi, Is it possible to fool a motherboard into booting even without the fan attached (assuming it checks the rotational speed before proceeding)? I thought shorting the 'SENSOR' and 'GROUND' pins would work at first, but if it's being used to detect the fan speed, then maybe not? The CPU_FAN connector on the Gigabyte motherboard has 3 pins (SENSOR, 12V and GROUND), if that's relevant(?). Any help would be appreciated, thanks! - Michael Strorm You can turn the protection off in the BIOS, where it's labelled Guardian Function. You'll just need something connected enough to get it to the BIOS. It just occured to me that this may also exist as a jumper rather than a BIOS option. |
#9
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- Michael Strorm You can turn the protection off in the BIOS, where it's labelled Guardian Function. You'll just need something connected enough to get it to the BIOS. Some motherboards default to this protection being OFF. Mine does, and I know this works because it is a watercooled system with no fans connected to the motherboard headers, and I have discharged the cmos afted updating the bios, and never had to use a fan or anything to get into the bios. I'd try discharging the cmos, or boot with default settings and see if it works. |
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