Weird problems with SSD Boot priority

[Zaros Nozara]

Okay, so I went away from home for a week to handle some out of town business, so I shut my pc down and flip to power off switch on the power supply after all of the fans stop spinning. A week later, I come home and flip the power supply switch back on and boot my system. Now I get prompted that I have no operating system. So I restart my pc, go into the BIOS, and it is only recognizing one of my 3 drives (my backup drive with no OS). So I try new cables and different ports, nothing changes. Next I look up online troubleshooting and find these steps. (Note: At this point the SSD isn't appearing in the Boot menu, or in the BIOS boot priority list)
1. Unplug data cable going to SSD and load into BIOS for 30 minutes  
2. Shutdown pc and replug data cable.  
3. Load into BIOS for another 30 minutes, and make sure boot priority is correctly configured.
4. Restart and boot the pc   
Result: Same message, I have no operating system  
At this point I try to go into to boot menu (Not the boot priority list) and notice the drive. I tried to launch it but I kept getting a black screen after windows. I repeated with different display options, and eventually got back to my DVI cable which wound up working fine now.  
So, I booted from the boot menu, downloaded the SANDISK SSD tool and ran both smart tests. The drive appears fine on both the long and short test. Great!
The only issue is now everytime I reboot my computer I have to go through the boot menu, or I will get told I have no OS. Any ideas that may help?

Drive: Sandisk z400s 240gb
CPU: Ryzen 1600
GPU: GTX 1060 6gb
RAM: 16GB corsair LPX
Mobo: ASRock - AB350 Pro4 ATX AM4 Motherboard

[CJPowell27]

I'd check for a BIOS update maybe? I'm not sure that would cause something like that but it's worth a shot

[Guest]

19 minutes ago, Zaros Nozara said:

Okay, so I went away from home for a week to handle some out of town business, so I shut my pc down and flip to power off switch on the power supply after all of the fans stop spinning. A week later, I come home and flip the power supply switch back on and boot my system. Now I get prompted that I have no operating system. So I restart my pc, go into the BIOS, and it is only recognizing one of my 3 drives (my backup drive with no OS). So I try new cables and different ports, nothing changes. Next I look up online troubleshooting and find these steps. (Note: At this point the SSD isn't appearing in the Boot menu, or in the BIOS boot priority list)
1. Unplug data cable going to SSD and load into BIOS for 30 minutes  
2. Shutdown pc and replug data cable.  
3. Load into BIOS for another 30 minutes, and make sure boot priority is correctly configured.
4. Restart and boot the pc   
Result: Same message, I have no operating system  
At this point I try to go into to boot menu (Not the boot priority list) and notice the drive. I tried to launch it but I kept getting a black screen after windows. I repeated with different display options, and eventually got back to my DVI cable which wound up working fine now.  
So, I booted from the boot menu, downloaded the SANDISK SSD tool and ran both smart tests. The drive appears fine on both the long and short test. Great!
The only issue is now everytime I reboot my computer I have to go through the boot menu, or I will get told I have no OS. Any ideas that may help?

Drive: Sandisk z400s 240gb
CPU: Ryzen 1600
GPU: GTX 1060 6gb
RAM: 16GB corsair LPX
Mobo: ASRock - AB350 Pro4 ATX AM4 Motherboard

Try reinstalling windows. Windows could be corrupted for all we know.

[Zaros Nozara]

I've recently reinstalled windows to help fix some tearing issues that I was having. I will check for the BIOS update tomorrow. I just got back to the pc. Thanks for the suggestions so far. I thought it was a drive failure and got lucky enough for a recovery that may not last long. However, I may need to reinstall windows again if there is a chance that the fix I used may have corrupted the windows, but that still shouldn't stop it from appearing in the boot priority list.