Turning off display with xset

This is driving me nuts. Currently, my Dell C400's display doesn't shut off when the lid is closed. I put "xset dpms force off" in acpi's handler.sh in the area under button/lid. If I run this command from a terminal, it works fine. But when I close my lid, the display flickers but doesn't turn off.
In the log, it says:
xset: unable to open display ""
I modified the command to be "xset -display :0 dpms force off", and now the log says:
button/lid
Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified
xset: unable to open display ":0"
What on earth am I doing wrong? Both commands work from a terminal.. :?

Wow, talk about an old thread..
And thanks it works perfectly heh. I ended up putting this in my handler.sh:
if grep -q open /proc/acpi/button/lid/LID/state
then
XAUTHORITY=/home/stonecrest/.Xauthority xset -display :0.0 dpms force on
else
XAUTHORITY=/home/stonecrest/.Xauthority xset -display :0.0 dpms force off
fi

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