ASUS support said plug red secure connect cable in 'top' SATA plug. Download VIA RAID driver 5420, install it at F6 (the only driver you'll need). Go into BIOS and disable Promise controller. This is for single HD, I guess. Seen lots of forums with same problems I've been having. Is there a 5420 VIA RAID driver?, dunno, gonna look for one. Nothing seems to have worked so far. See 'spot' run.lol