PC cycles on and off after attempting to update BIOS.

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Matt582

Matt582

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Jan 6, 2014
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I tried to update my BIOS on my motherboard a few years ago and I guess the update failed so now every time I try to turn it on it cycles on and off (the fans start to spin) until I turn the power supply off. Is there anything I could do to fix it? Would getting a new bios chip work?
 
Solution
bgunner


There is no need to short out the Battery connectors at all.

There are a few ways to Clear the C_mos/ reset the bios and they are 1. If equipped you can push the provided clear C_mos button. 2. Most if not all boards have a 3 pin clear C_mos jumper. this jumper can be moved from pins 1 and 2 to 2 and 3 then right back. this will instantly clear them. 3rd is remove the power cord and pull the button battery, then wait 30 seconds and replace the battery. The...
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Greg Gregorich

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Feb 13, 2014
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so if the pc in a working state you can update again,if not the BIOS get corupted.to replace a chip its not easy task if you never done that.may help clear CMOS by removing BIOS battery and shortened plus and minus CONNECTORS with metal like scissors for couple seconds.MAKE SURE THE PC TURNED OFFF
 
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bgunner

bgunner

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Feb 13, 2009
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There is no need to short out the Battery connectors at all.

There are a few ways to Clear the C_mos/ reset the bios and they are 1. If equipped you can push the provided clear C_mos button. 2. Most if not all boards have a 3 pin clear C_mos jumper. this jumper can be moved from pins 1 and 2 to 2 and 3 then right back. this will instantly clear them. 3rd is remove the power cord and pull the button battery, then wait 30 seconds and replace the battery. The battery holds all settings when the the PC is unplugged.

If this does not work then you will need to either send the chip to be properly flashed or replace the chip with a known good one. Bios chips are not usually soldered in but actually in a socket but extreme care needs to be used when removing and replacing the chip.

Shorting out the battery terminals while the PC is plugged in will cause a HARD short feeding back to the PSU and if the PSU does not have proper protection on that circuit it can hurt both the PSU and the motherboard. Shorting out the terminals on the battery if very bad advice.
 
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Solution
photonboy

photonboy

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Jun 20, 2006
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Some motherboards have dual bios, or can flash the single BIOS even if it's corrupted.

You should list your motherboard model in case others have advice.

Clearing the CMOS can't really hurt, but it won't help if the BIOS is corrupted. The CMOS simply stores the settings you've changed since you flashed the BIOS. I doubt it would help, but go ahead and try (see motherboard manual).
 
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