I know this may sound silly, but have you tried rebooting the computer, starting up TD, and then connecting the external display? There's been a few issues that I've had with my computers over the years that have just vanished with doing just that (at least the rebooting), so this may help take care of it. I definitely echo Corey here, definitely not a TD issue. I use an external display all the time and never had a blurry screen (even with connecting it prior to turning on my laptop). My question is this: does the blurry text/screen happen only with TD, or is it all the time? If it's all the time, it just may be that the refresh rate may be incompatable with the computer that you're using, and needs adjustment (Usually 60Hz is good for most computers).