So last night I was doing my thing, modding Skyrim, fartin' around on Youtube. Earlier in the night I had added 2 intake fans to my case, nbd. Sealed 'er up, and around 1 AM, I shut my PC down, from the start menu, traditionally. Everything's fine!
I wake up today, and I boot her up...and I get this message:
Reboot and Select proper Boot device or Insert Boot Media in selected Boot Device and press a key.
I reset the computer a few times, kept getting the message. I turned it off for a few minutes then tried again, same message. I swapped the SATA cables (the fat ones from the PSU) and still, the message appears. Made sure I didn't have any loose SATA cables, still, the error persists. I swapped the tiny SATA cables from my HDD and SSD (My OS is installed on my SSD), and after my PC repeated itself one more time, it booted up...and then shut off, never saw the login screen, only the rotating windows loading icon of Windows 10. I restarted, and bam, booted up finally. And it's running fine now.
What the hell happened?