I have a Dimension 8300 ...... Originally it had a 160 GIG SATA HD. I purchased a 250gig IDE HD and cloned the partition from the SATA HD to it. I then wiped the SATA to use for a spare (D: drive). When I start the PC I get dreaded NTLDR is missing. If I shut off SATA in the BIOS it runs fine, but I can't see the SATA drive under Windows because it's off in the BIOS. Once I turn SATA back on again in the BIOS the PC won't start. I'm assuming the problem is the Mobo is looking at the SATA as being Hard Drive C: . How can I change it to recognize the IDE HD as C: with the SATA still connected? The 'Boot Sequence' listing in the BIOS only shows - Floppy Device (not installed), IDE CD-ROM Device and Hard Disk Drive C: ...... Nothing about SATA. Under 'Drive Configuration'  -  SATA Primary Drive - Hard Drive, SATA Secondary Drive - OFF, Primary Master Device - Hard Drive, Primary Slave Device - OFF, Secondary Master Device - CD-ROM and Device and Secondary Slave Device - CD-ROM ..... I have tried both jumper settings on the IDE HD, Cable Select and Master .... Didn't make a bit of difference ......  Help!