External drive and hard drives won't show up

I've had off and on problems opening my Pioneer blu-ray burner and my two LaCie external hard drives on my MacBook Pro 4,1 running Snow Leopard. Now, I can't get them to open at all. The cables, the HDs and the drive are all fine on my desktop.
Any suggestions?

Do they show up on the device list in System Profiler? In Disk Utility?

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