SPECS - HP Pavilion Power Desktop 580-068 Windows 10. So, yesterday I planned on using my Rift S. Whenever I plug it in though, it tends to turn off my mouse and keyboard and I cannot use them at all. So I turned off my pc and turned it on. This is what I usually do to remedy it. Except, when I turned it on, I was met with Boot device not found- 3F0. Now, I’ve run every test so far with success - hard drive short/long test, memory test SMART test all passed. I took off my PC side panel and unplugged and replugged the cables connected to my hard drive. No luck.