How to reset the CMOS using jumpers

40 pts.
Tags:
Bypass BIOS passwords
CMOS
Dell Latitude C640
Motherboards
Dell latitude C640

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Every motherboard is different. You’ll want to find the model number for your motherboard and find the manual online.

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Remove the main battery and power supply first. You can clear the BIOS by moving the jumper which is in the RAM compartment to it’s alternative position for a few seconds and then back again. Remove the main battery and power supply first.
Good Luck!
-Flame
Mrdenny:
Thank you for your help,

Pintpast.

-Flame:
Thank you for your advise,
Pintpast.

Discuss This Question: 4  Replies

 
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  • Dickep
    You should be VERY careful doing this. There are settings that are set in some CMOS/BIOS areas that are NOT able to be set back to "factory default" setting as some of the newer chips and programs store them in a non-volatile area (like an EPROM). However, there is a CMOS/BIOS/Real time clock backup battery on the motherboard near the chip. Remove main power and this battery and leave the unit in that condition for about 30 minutes and the setting may be reset. Leaving it for 30 minutes usually allows any stored energy on the motherboard to dissipate. However, I agree that you need to check out the motherboard manufacturer and find a manual/guide online to make sure that is all you have to do. Most do not have jumpers like the old type but.... some still carry on. Good luck and am wondering why you want to clear the BIOS/CMOS. You should be able to get into it using the DEL key or one of the function keys at POST/BOOT.
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  • Pintpast
    Dickep: Thank you for your advise. The reason I wanted to reset de CMOS was because when i turn on my laptop, after a few seconds the laptop goes off and after trying several times it does not turn on even no lights. I'm not a computer guy I was wrong. I still have the same problem. If somebody can help me I appreciate any info. Thanks
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  • Denny Cherry
    Sounds like the powersupply and/or battery has died. When you plug in the power supply do any lights come on?
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  • Pintpast
    mrdenny: I think it was the battery, because after one day charging it now it work fina. Thank you for your help. pintpas
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