You are welcome but beware! there is an old saying:

"Little problems that come, then go away of their own accord, frequently return having greatly increased in stature"

If it ain't broke, then don't fix it, but, if the problem comes back I would try my suggestion regarding the video manager and reinstallation.

When you go into safe mode, you won't get the manager. You have to go into your programs, open the folder and lauch it manually............basic methodology for troubleshooting in safe mode as it happens

Another thought (only if it happens again!) is that the video card might not be firmly seated?.....................it did get shipped back to you pretty recently?