Ok, swapped around the pci cards to give the prophet some breathing room...seems to have sorted the problem, thanx for your ides though

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AMD Athlon 1.4GHz
ASUS A7V266
256MB Crucial PC2100
Hercules Prophet 4500
Fujitsu x174
Creative SB Live 5.1
Cambrige Works DTT2200
IBM Ultrastar 36LZX (20GB)
Adaptec 19160 SCSI
Pioneer 6X SCSI DVD