It will make it easier to help you w/ your problem to know know more information about your computer; size, exact year built, RAM installed and OS you're running. Any history prior to your incident would also be helpful.
Here's a quote from that OWC Blog that I referenced:
http://blog.macsales.com/15617-creating-your-own-fusion-drive
"Setting up a Fusion Drive
- A 2012 Mac mini – this is anabsolute requirement as these are the only machines that currently have a version of Disk Utility that can create a Fusion volume.
- A hard drive and an SSD installed/to install internally – Fusion is designed to work on internal drives only.
- An external drive to clone to – creating a Fusion volume will erase both the SSD and the hard drive, so if you have information on the hard drive you want to keep, you’ll need to have a copy of that data elsewhere."
Here's an interesting alternative to a fusion setup:
http://blog.macsales.com/24915-splitting-your-data-an-alternative-to-fusio