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oparating system not found when booting is Sata option AHCI
so here what's wrong with my comp , i have an m17 r2 alienwAre laptop.in the bios menu the sata option HCAI is selected but when the comp boots it says no operating system is found when booting for bios sata option RAID it runs fine. But the comp should be on HCAI in order to run features that a specific to that computer . I have tryed reformatting but in HCAI it on finds the second of 2 500g hard drives but the partition with the boot is on hdd1 not hdd2 . Boot up again with RAID it finds both and and I can reformat . I have tryed to reset the registry and have tryed using drivermax to find out if I'm missing sata drivers I've also tryed reinstalling my bios from the dell/ Alienware site now im lost one what to do please help :)