Cannot change the display mode

Newbie & Debugging Questions
#1

Hi,
I have made a full-screen game,
previously it’s worked well, but after I reinstall my operating system, Windows XP
my program got error,
java.lang.InternalError: Could not get display modes
I’ve checked that the device.isDisplayChangeSupported() return false.

Can anyone help me, what’s the problem? is it the problem with win XP? how can I configure it to solve the problem.

Thx a lot

#2

make sure you have displayed the window/frame in fullscreen before you attempt to change display modes

#3

Thx, I’ve solved the problem, it was because I didn’t install the display driver properly