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Dell Inspiron 9400 will not charge - AC adaptor not recognised

My Inspiron 9400 will not charge off the AC power adaptor. I have bought a new power cord and now a new battery. I have read that I have to flash the bios but I dont know what that means. Please explain... It has also been said that I need 10% battery to do this, why? 
I have downloaded a bios update, is this flashing it?
Thanks for the help.

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  • travel583 Jun 18, 2009

    Both the power supply and battery are new because I had the same problem with the old battery and power supply. I will try to flash the bios but at the moment it says both the power supply and battery have to be plugged in first which they are but it does not recognise the power supply.

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Does the laptop power up just no charge the battery? If the laptop does not power on then you may have a bad power supply in the unit. If it does power up than you most likely have a bad battery connector of blown fuse on the motherboard. The flashing of the BIOS is done with a bootable cd or floppy but this will not keep the new battery from charging. The reason Dell states that you need at least 10% battery to flash a BIOS is because if your AC power goes out while you are doing a BIOS upgrade and you don't have battery power the BIOS will be incomplete and your laptop will not boot again without replacing the motherboard.

Posted on Jun 17, 2009

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