So I bought the OWC data doubler kit for my 2009 mini, as I'm using it as a media server and wanted more hard drive space. Along with the data doubler i purchased a Seagate Backup Plus Slim. Prior to dismantling the mini I installed Yosemite. I tested that the drive was working properly on my iMac, I even booted from that drive and everything went smoothly. So I cracked open the enclosure of the Backup Plus and extracted the drive (it's a bit cheaper to get a 2tb hard drive for some reason) I took the mini apart, keeping up with any screws or connectors I was removing. I opted to put the new drive on the bottom, as I wanted it to be my new startup drive.. Because I put all of my media on that one drive. (before it was scattered across 3 different computers. So I installed that new drive in the old drive's place, and put the old drive in the data doubler. Now when I go to test it it starts up and there is a folder with a question mark flashing back at me. I googled the problem, tried holding down option, and shift at startup to get into recovery mode and safe boot. When I do that it comes to a white screen with a wifi symbol and a drop down menu to select a network. I tried selecting mine thinking that it'd move to the next step. But it didn't it just sat there.. I'm really stumped, the sound also isn't working. So I am thinking I may have neglected a connector or two when I took it apart. But I wanted to post up and see if anyone knew anything or had experience with this before disassembling the mini again... If my only casualty is the sound I can live with it, as the on board speakers aren't very loud and I use external speakers anyway. Thanks for any input you are able to offer!