I recently built my first PC (specs at the bottom) and everything worked fine. However, I noticed that my PC would crash randomly to a black screen asking to select proper boot device or insert media drive (something to that sort). After browsing online and asking around, I was directed that my HDD was failing and to get a replacement. I had plenty of time to return it to Newegg so while that was out, I bought a small 64GB SSD during which I never ran into any problems. A couple days ago I got my HDD replacement, connected it back in and restarted my PC with a fresh install of Windows 10 on my HDD while the SSD would be used for programs. Once again, my PC started to crash though this time only when it idled. I've since put the HDD in a new Sata Port but still no luck, I get the crash after leaving the PC idling. I've read that preventing the HDD from hibernating or sleeping may fix this and I've set the HDD to do just that but I have yet to test it out fully.
I've tried to run tests with SeaTools for Windows and CrystalDisk and everything came back good. So I'm generally confused as to what may be causing this. Did I get another failing HDD from Newegg, is there something else I should check? Any help would be greatly appreciated!
CPU: AMD X4 860K
Motherboard: Gigabyte GA-F2A88XM-D3H
Memory: Team Elite 8GB (2 x 4GB) DDR3-1333
Storage Main: Western Digital Blue 1TB
Storage Secondary: Kingspec 64GB SSD
Video Card: EVGA GTX 950 2GB SC+
Power Supply: EVGA 500W 80+
OS: Windows 10 64-bit