Hi All, I am using a MA790X DS4. with this configuration: Maxtor 80gb IDE (2 partitions, XP and a data partition). Jumpered to CS, on IDE0 slave. An optical drive on IDE0 master, again, set to CS WDC 320Gb SATA on IDE1 M (2 partitions, W7 and a data partition) WDC 320GB SATA on IDE2 M (1 data partition) Now, I wanted to remove the Maxtor, and leave just W7, however, when I do that, only 1 of the SATA drives is recognised, and the system hangs at 'Verifying DMI Pool Data......' I've tried various configurations - changing boot order, removing the optical drive, disabling the IDE in the BIOS etc. I have reset the CMOS by removing the battery for 30 minutes and restarting, but the system only boots sucessfully when the Maxtor is in place. I hope I've included all the info that's needed. Any ideas anyone, it's driving me crazy! Many thanks, Richard.