I have similar issue.
Just bought 480GB Ultra II SSD and I am going to transfer whole content from my HDD. I already made a clone disc using Apricorn EZ GIG, than I inserter SSD into my HP laptop. Unfortunatelly, computer doesn’t boot. Just after turning computer on an error screen appears - device is not connected or can not be recognised. For sure I plugged the cable in correctly.
Any ideas what went wrong and how to fix it?