Hi - Wondering if anyone can help. This evening, I've noticed that my iMac locks up whenever copying data to external hard drives and has stopped recognising external optical drives. The only things that I've done prior to this happening is to install the latest EFI (Boot ROM Version: IM71.007A.B03) and Toast 9. Any suggestions as to what might be causing this - I'm using Lacie Quadra's and have tried connecting via Firewire 400/800 and USB 2. I get 'some' data transfer which just locks up at a random point ? Thankyou.