Solved. Thanks for the replies. The motherboard is an ASRock Z77 Pro4. It has two types of sata ports. ASMedia Sata3 and Intel Sata3. I moved the dvd burner connector from the ASMedia Sata3 to the Intel Sata3 and all works once again. Doesn't tell me if the ASMedia ports are failing or if the more recent rescue cds have trouble with these ports.
From the ASRock website:
- 2 x SATA3 6.0 Gb/s connectors by Intel® Z77, support RAID (RAID 0, RAID 1, RAID 5, RAID 10, Intel® Rapid Storage and Intel® Smart Response Technology), NCQ, AHCI and Hot Plug functions
- 2 x SATA3 6.0 Gb/s connectors by ASMedia ASM1061, support NCQ, AHCI and Hot Plug functions