I forgot how to reattach the CPU fan so it's sort of hanging loose, the HD wouldn't go in with two little pins in place so it's sitting loose...
But hey the thing is running.
EEK! You really should look into fixing the CPU fan/heatsink. That's a MUST. Otherwise, I don't know how much longer the thing will be running. This is a 4670K, right?
HDD should be mechanically-secured as well, otherwise, it can vibrate itself to death, and cause a head crash. You wouldn't want that on your new 5TB drive, would you?
Not trying to pick on you, just looking out for you and your gear, with best practices.
Edit: In order to use a brand-new, fresh-from-the-factory HDD, you need to:
1) shut the system off (or use a hot-swap caddy), and plug in the drive, into both power and data.
2) boot the system, and open Disk Management. If you're on Windows 10, you can right-click the Windows Icon / Start Menu icon, to get a "Master List" of locations, of which Disk Management should be there. If on Windows 7, click Start Button, right-click Computer, and select Manage, Then click on Disk Management on the left-hand side of the window that comes up.
If a drive is truely factory-fresh, Disk Management will prompt to "Initialize" the Disk, which can be done either with MBR (for HDDs smaller than 2TB), or GPT (for HDDs 2TB or larger).
Once that's done, maximize the Disk Management window, and there will be two panes, one on top, with drive letters, volumes, and FS formats, and then the bottom (scrollable) window, with some graphical depictions of disks as horizontal volumes.
Find the disk that you just initialized, and in the empty space, right-click and select Create Volume, specify the partition size, filesystem type, Full or Quick format. I recommend Full format for brand-new factory disks, just to do a surface test by writing to every sector. You may not be so cautious, and willing to wait that long (hours). In that case, just select Quick format (the default). Generally, you want to use NTFS in Windows.
That being said, PLEASE FIX THE CPU FAN FIRST. Thanks. Otherwise, your PC may not survive the HDD formatting process.