My son came to visit for the holidays and brought his P8z77-V Deluxe system, that I had given him last year. We disconnected my ROG box and plugged his in and realized his nVidia GTX-780-Ti had different digital outputs than my GTX-980sc. I swapped the video cards and plugged in the system.
The system booted into safe mode? After going into the BIOS I saw that the SSD was not listed? I unplugged and reconnected the power and both ends of the cable to the MB. Rebooted into the BIOS and found the SSD although it was not the primary? Changed/saved and rebooted.
System came up perfectly and rebooted and started from scratch for the entire day.
Next day the same problem occurred! This time I changed the connections for both the HDD and the SSD on the MB and power supply. Rebooted and all was well. Saved the BIOS config again and used the machine all day again without problem.
Today, same old problem, no SSD shown in the BIOS. Checked ASUS website and confirmed all MB drivers including the BIOS etc are up to date. GTX-980sc is using latest drivers. Windows 10 did do a major update today fwiw.
He is running an i7-2600k at 4.4, and has been for over a year, a dual boot Win-7x64 (HDD) and Win-10x64 (SSD).
The only thing that changed was the video card as far as I can tell. No, I haven't tried changing the cards back yet as I run a 3 screen setup (which he does on his home system also) and we don't have the correct cable ends here.
Any ideas? The only thing I can think of is the date change or a completely cold system? Both seem illogical and very unlikely.
Thanks
Rick S.