Ahci port hangs during boot?

On boot pc will hang with the last line reading auto detecting ahci port 1. Did the usual thing of unplugging every thing(hdd/blu ray/usb/graphics card),etc. Pc now boots past and states no operating system detected etc as it should with no drives. Now i tried pluging drives back in one by one, but any drive plugged into any of the ports causes the hang. Though connecting one of the drive thru old fashioned ribbon sata port does not produce this error. but since my OS is on the newer type drives without this connection i am stuck. Any ideas would be welcome.