At the moment, with a DVI cable, I can only get a 4:3 picture from my MacBook Pro onto my LG DU-37LZ30 LCD TV.

This is what SwitchResX tells me:

Established Timings:
--------------------
800 x 600 @ 60Hz
800 x 600 @ 56Hz
640 x 480 @ 75Hz
640 x 480 @ 72Hz
640 x 480 @ 60Hz
720 x 400 @ 70Hz
1024 x 768 @ 75Hz
1024 x 768 @ 70Hz
1024 x 768 @ 60Hz
800 x 600 @ 75Hz
800 x 600 @ 72Hz

Manufacturer Reserved Timings:
------------------------------

Standard Timing Identification:
-------------------------------
#0: 640 x 480 @ 70Hz (314A)
#1: 640 x 480 @ 85Hz (3159)
#2: 720 x 405 @ 85Hz (3BD9)
#3: 800 x 600 @ 85Hz (4559)
#4: 1024 x 768 @ 75Hz (614F)
#7: 256 x 192 @ 60Hz (0140)

Monitor Description blocks:
---------------------------
Descriptor #0 is Timing definition:
Mode = 1024 x 768 @ 75Hz
Pixel Clock.............78.75 MHz Non-Interlaced

Horizontal Vertical
Active..................1024 pixels 768 lines
Front Porch............. 16 pixels 1 lines
Sync Width.............. 96 pixels 3 lines
Back Porch.............. 176 pixels 28 lines
Blanking................ 288 pixels 32 lines
Total...................1312 pixels 800 lines
Scan Rate............... 60.02 kHz 75.03 Hz

Image Size.............. 820 mm 460 mm
Border.................. 0 pixels 0 lines

Sync: Digital separate with
* Positive vertical polarity
* Positive horizontal polarity

Descriptor #1 is Monitor name:
LG LCD
Descriptor #2 is Monitor limits:
Horizontal frequency range.......30-62 kHz
Vertical frequency range.........56-85 Hz
Maximum bandwidth unspecified

Descriptor #3 is Monitor name:
DU-37LZ30


The pixel dimensions for the TV are 1366x768. I tried adjusting the resolution to that, but no go. I also tried 640x350 and 720x400 which are listed in the TV manual as acceptable resolutions, but those gave me no picture either. If anyone has any advice on getting this to work, I would appreciate it!