Hi there, I've been looking quit a while on this topic for a solution for my similar problem. I can't get my new SSD working with AHCI enabled on my nForce mobo. In IDE mode everything works fine, but I really want to get it working with AHCI. Hopefully you can help me. As far as I read on this topic I do believe in the expertise of Fernando. The things I've read so far has only to do with Windows XP while I'm using Windows 7. Please help! Further specs of my system: OS: Windows 7 x64 Mobo: M3N-HT Deluxe (nForce 780a SLI) SSD: OCZ Vertex 3 (firmware 2.15) HDD: Samsung Spinpoint 103SJ MEM: 4GB Kingston 1066Mhz VGA: Onboard (external just died, looking for a new one) DVD-RAM: LG or something. FLOPPY: nope, but I do have a bootable USB What I've tried: After 2 months working on Windows 7 x64 on IDE mode I decided I wanted to change to AHCI mode. Tried the register tweak (change .../msahci/start value from 3 to 0), reboot, change IDE to AHCI in BIOS. Results in endless reboot at the point of loading Windows. After that I tried to reinstall directly on AHCI mode. Same results. Tried other SATA ports on my mobo. Didn't work as well. Again installed on IDE mode and searched for ours and ours to a solution. Nothing comes close as this topic but I'm quit dizzy right now of all the research. I put all my trust in you guys. Thanks in advance! FBratwurst By the way: it's not an issue for me to reinstall.