Acer G215H widescreen off-center in KDE x-win environment - dist. Slackware 13.0
I've recently installed Slackware 13.0 without a hitch (I haven't tweaked much yet), ran adduser, switched to the new account in a second virtual screen, typed in 'startx' and was pleased to see things start up. Then I discovered the widescreen display was off center, leaving a black bar on the right edge of the screen and the menu button in the lower left corner completely off screen and not visible (even the menu when I was able to click around and pull it up shows only the right edge of the menu box).
I have no idea how to properly configure a widescreen and the documentation is a little confusing. I read a couple of posts on the subject on here but I'm enough of a newbie that my ignorance is interfering with my comprehension. Any assistance would be helpful.
Thank you for any help ahead of time, even if it's pointing me to the right help file (as I am even unsure what manpage to read or if it would make any sense if I did).