No, it's the same channel. You connect either an internal or an external device to it. But I think Thomas probably nailed this one. You've got an old card and a new G4. If not that, then there's something wrong with either the card or the PCI slot. Have you tried moving the card to another slot? Is there another G4 you can try installing the card in? Have you tried booting with nothing connected to the card? Have you burnished the contacts on the edge of the card? Have you tried Safe Boot? I'm not sure if Safe Boot will load the drivers to allow the system to recognize a SCSI card or not, but I think it will. Check Apple System Profiler and see if the card shows up. Brian -----Original Message----- From: Power Macintosh G4 List [mailto:G4 at lists.themacintoshguy.com] On Behalf Of diane Sent: Monday, June 02, 2003 9:48 PM To: Power Macintosh G4 List Subject: Re: [G4] SCSI cards and sleep (was...and new MDD's?) >Diane, > >The PSC is a single channel Ultra/Wide 40MBps SCSI card. I haven't >followed this thread closely. Is your problem that the G4 won't boot >with the card installed? Or is it something else? Nope, you got it. Won't boot at all, screen won't even register that it's connected Maybe I'm confused on dual channel, that doesn't mean one internal, one external channel? Diane