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Why won't my Duron(after week 31) boot on my KT7?

This applies to BIOS TL only. AMD changed the specification of some Duron processors manufactured after week 31, so that they require a core voltage of 1.6v rather than 1.5v. If your processor is a week 31 Duron or later it will include the characters "AUT" and "0031" or higher in the serial number. Iif your motherboard shipped with BIOS TL and you have a week 31 Duron, your machine will fail to boot. To resolve this problem you need to upgrade to BIOS UL, but this is difficult if you can't get the machine to boot! You have three options: Take the motherboard or BIOS chip to your supplier, together with the latest BIOS and flash utilities on a floppy disk, and get the shop to flash the BIOS for you. Borrow another Socket A processor from a friend or shop, boot with this, flash to BIOS UL or later, and then reinsert your week 31 Duron. Use an HB, B or 2B pencil to close the 2nd L7 bridge (this is the 2nd bridge out of 5 counting from the end nearest to the L7 title and excluding the dot) on the top of the CPU. It may look like this: |:|:|. L7 and set to |:|||. L7 . This sets the voltage manually at 1.65v and allows the machine to boot. You can then flash to the later BIOS.