Says that my computer is running in low-graphics mode, but cannot run failsafe x. How do I fix this?

Says that my computer is running in low-graphics mode, but cannot run
failsafe x. How do I fix this?

When I start up my computer it tells me I am running in low graphics mode.
I've read tutorials on how to fix this and they all say I need to run
failsafe x. When I try to run failsafe x nothing happens. My screen starts
out black and sort of fades to a bluish and then to an orangeish and then
to black, but nothing else happens. What the heck is going on and how do I
fix it?