Simple Function Problem, please help

[ShadowWarrior17]

def columncheck(c):
    x=5
    pos=False
    while pos != True:
        if dboard[x][(4*c)-1]== " ":
            pos=True
        elif dboard[x][(4*c)-1] != " ":
            x-=1
    return x

When this function returns x, x is always 5.

Why?

It has been annoying me for days.