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Thank you for replying, I'm now using the lastest BIOS version even beta version F14c. I also tried with F13, the result is still the same. I noticed that either BIOS version F13 or F14c, the AHCI BIOS version is the same and old, i think. This is the message that is displayed on my screen: "Serial ATA AHCI BIOS version iSrc 1.07 08042006" So, probably Gigabyte has not been updated the intel AHCI on their updated BIOS. Any idea? Thanks.

Nobody has any idea? . I tried to plug on any yellow SATA port, but still the same problem. Please help me. Thanks

Hi everyone, I have just experienced the following problem with my desktop. - Windows XP + AHCI mode (Intel port, yellow) ==> Shutdown + Power off successful - Vista Home Premium 32bit + AHCI mode (Intel, yellow port) => Shutdown but not Power off - Vista Home Premium 32bit + AHCI mode (JMicron, purple port) => Shutdown + Power off successful - Vista Home Premium 32bit + IDE mode => Shutdown + Power off successful As you seen, using AHCI mode with purple port is fine but if I plug the second HDD into the second purple port, this HDD will appear as USB HDD in windows. Therefore, I want to use the yellow port which is Intel controller. Any suggestion to fix power off problem when using Intel SATA controller? Thanks. My specification: CPU: Pentium D 3.2 Main: Giga P35-DS3 Graphic: NVIDIA 7100S HDD: Seagate 250