External Display native resolution suddenly not available

Question

Hello,
I'm using a Westinghouse LCM-22w3 external monitor with my MBP, connected via a DVI-to VGA adapter. I've used this computer/monitor setup for quite some time with no problem. Yesterday, I hooked my computer up to my 46" Samsung HDTV with no problem.
When I hooked my computer back up to the Westinghouse, the native resolution (1680x1050) was no longer available. Instead, the monitor hooks up at 1600x1000. Strangely, though, the EDID information appears to suggest that 1680x1050 should be available. Here's the EDID:
DDC block report generated by SwitchResX version 4.1.1 for display
LCM-22w3
------------------- RAW DATA ------------------------
0 1 2 3 4 5 6 7 8 9 A B C D E F
0 | 00 FF FF FF FF 91 FF 00 5C 85 03 22 01 01 01 01
1 | 13 11 01 03 68 2F 1E 78 2E C5 85 A4 59 49 9A 24
2 | 12 50 54 BF EF 00 81 80 81 40 71 4F 95 00 95 0F
3 | B3 00 81 C0 81 00 21 39 90 30 62 1A 27 40 68 B0
4 | 36 00 D9 28 11 00 00 1C 00 00 00 FD 00 38 4C 1E
5 | 52 10 00 0A 20 20 20 20 20 20 00 00 00 FF 00 30
6 | 0A 20 20 20 20 20 20 20 20 20 20 20 00 00 00 FC
7 | 00 4C 43 4D 2D 32 32 77 33 0A 20 20 20 20 00 1D
< 00FFFFFF FF91FF00 5C850322 01010101 13110103 682F1E78 2EC585A4 59499A24 125054BF EF008180 8140714F 9500950F B30081C0 81002139 9030621A 274068B0 3600D928 1100001C 000000FD 00384C1E 5210000A 20202020 20200000 00FF0030 0A202020 20202020 20202020 000000FC 004C434D 2D323277 330A2020 2020001D >
Invalid EDID block: checksum failed. Last byte should be 8B
------------------- MAIN EDID BLOCK -----------------
EDID Version........1.3
Manufacturer........WDE
Product Code........802 (0322) (2203)
Serial Number.......01010101
Manufactured........Week 19 of year 2007
Max H Size..........47 cm
Max V Size..........30 cm
Gamma...............2.20
Display Supported Features:
Power Management: Active off
Display type:
RGB color display
Display is non continuous frequency
Default color space is sRGB standard
Preferred timing mode includes Native Pixel Format
Input signal & sync:
Analog input with: 0.700V / 0.000V
Composite Sync
Color info:
Red x = 0.644 Green x = 0.286 Blue x = 0.143 White x = 0.313
Red y = 0.348 Green y = 0.603 Blue y = 0.070 White y = 0.329
Established Timings:
720 x 400 @ 70Hz
640 x 480 @ 60Hz
640 x 480 @ 67Hz
640 x 480 @ 72Hz
640 x 480 @ 75Hz
800 x 600 @ 56Hz
800 x 600 @ 60Hz
800 x 600 @ 72Hz
800 x 600 @ 75Hz
832 x 624 @ 75Hz
1024 x 768 @ 60Hz
1024 x 768 @ 70Hz
1024 x 768 @ 75Hz
1280 x 1024 @ 75Hz
Manufacturer Reserved Timings:
Standard Timing Identification:
#0: 1280 x 1024 @ 60Hz (8180)
#1: 1280 x 960 @ 60Hz (8140)
#2: 1152 x 864 @ 75Hz (714F)
#3: 1440 x 900 @ 60Hz (9500)
#4: 1440 x 900 @ 75Hz (950F)
#5: 1680 x 1050 @ 60Hz (B300)
#6: 1280 x 720 @ 60Hz (81C0)
#7: 1280 x 800 @ 60Hz (8100)
Monitor Description blocks:
Descriptor #0 - Timing definition:
Mode = 1680 x 1050 @ 59.954Hz
Pixel Clock............. 146.25 MHz Non-Interlaced
Horizontal Vertical
Active.................. 1680 pixels 1050 lines
Front Porch............. 104 pixels 3 lines
Sync Width.............. 176 pixels 6 lines
Back Porch.............. 280 pixels 30 lines
Blanking................ 560 pixels 39 lines
Total................... 2240 pixels 1089 lines
Scan Rate............... 65.290 kHz 59.954 Hz
Image Size.............. 473 mm 296 mm
Border.................. 0 pixels 0 lines
Sync: Digital separate with
* Positive vertical polarity
* Negative horizontal polarity
Descriptor #1 - Monitor limits:
Horizontal frequency range.......30-82 kHz
Vertical frequency range.........56-76 Hz
Maximum bandwidth unspecified
Descriptor #2 - Serial number:
0
Descriptor #3 - Monitor name:
LCM-22w3
Any ideas? Switchresx didn't work, either

Answer 1

Well, you can move the file from the desktop back to its original location to at least get back to what you had before.
The file structure under Snow Leopard has changed and it's hard to keep up with this stuff. There is also now a com.apple.WindowServer.plist file in /System/Library/LaunchDaemons that you could try moving to the desktop and restarting. I dunno. Same rule applies.....if it doesn't help, move the file from the desktop back to its original location.