If you know the correct resolution for your screen try this with the live dvd before implementing it.
Boot live dvd upto boot menu select music / no music and press F5 and text apears at the bottom of the screen.
I add " xdriver=nvidia res=1440x900 " to the text and then enter to boot.
Once it is finished it should auto have the correct res you want. Nvidia control panel could also fix this but the save now button does not save the xorg.conf so open it from nvidia controll panel + copy + paste to current xorg.conf or make a new text file with this and backup current + replace with new xorg.conf.
If this works using the boot cheat codes "readme file on dvd /iso" then edit /boot/grub/grub.conf and add xdriver=nvidia res=1680x??? with correct info in it and reboot. Then it should work correctly.
Problem is most people think that a hdtv 1080i or something has to run at other resolutions but hdtv will only work with the 1080i if it is connected via the hdmi connection at the 1080i.
If connected to a 15 pin white vga or the blue ? dvi out then it is a screen with screen resolutions and this can be confused sometimes.
Is this the same model as yours ?http://www.plasma.com/pioneerplasmatv/pdp4270hd.htm
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# Native Resolution XGA 1024 x 768
# Aspect Ratio 16:9 Wide-Screen
# Brightness Data Not Available
# Contrast Ratio Data Not Available
Hope this helps.