The ks0108 reset line is an active low line. (when low, the ks0108 module is held in reset)
It needs to be high for normal operation.
However, while connecting it directly to 5v works for most glcds, it doesn't work for some as
some ks0108 glcds do not self reset on power up and and need a H->L->H pulse on their reset line
to properly reset.
Read the notes about the glcd reset pin on the ks0108 playground pagehttp://playground.arduino.cc/Code/GLCDks0108
The tables and text show how to wire up the glcd reset line.
Don't miss the special note I wrote about it in the section: GLCD reset pin NOTE