Blank dashboard – white screen of death?

About a week ago, I noticed that when I tried to get to my dashboard, nothing would display – just a blank, white page. I’ve done a lot of troubleshooting and have tried the following:

-Renamed themes folder to rule out theme issues
-Renamed plugins folder to rule out plugin issues
-Checked for extra spaces at top and bottom of functions.php

I’m pretty stumped. As far as I can recall, I didn’t do updates of any kind that would bring this on. It seems to have come out of the blue (luckily, my site is running perfectly). Any advice would be greatly appreciated!