I got my Mac Mini (2012 base model) a couple of weeks ago and have since upgraded it by replacing the internal hard disk with a Samsung 840 Pro SSD. The upgrade went by without any issues. However, today when I booted my computer I was greeted by the dreaded "no system disk found" symbol. I removed the SSD and successfully booted the computer using a USB 3 drive bay. The SSD works fine; however, *any* drive placed in the internal drive bay (including the original 500GB HD) simply is not recognised by the system. I've had a look round but all connectors seem to be attached securely. Is there a chance I've damaged the internal SATA cable somehow, or could there be some deeper problem? Any answers much appreciated!