Problem: No DVI-D output; GMA4500MHD - LG L204WT - Dell E6500

[idata]

I have 1 x LG L194WT, 2 x L204WT's and I can't get DVI to work with any of them... not properly anyway. I want to use the two L204WT's with the DVI output, I've only been using the L194WT for testing to try and help diagnose the problem.I can get 800x600 video to them, but with 1440x900 and 1680x1050 native resolutions respectively, that's pretty pointless... When I set the video to the native resolution, the monitors are enabled (ie, they come out of standby) but are totally black. They are recognised by the OS just fine.I'm using a Dell E6500, with PR02X dock, with dual DVI-D outputs... monitors are DVI-D input. I'm using dual link DVI-D cable (all pins bar the analogue ones). Intel number is GMA4500MHD. I'm using the latest video driver (7.15.10.1637) from the Dell website, the driver from Intel website doesn't work and tells me to use the manufacturer driver pack. OS is vista 64. (Update: I've just installed W7 7100 and all updates without improvement)Here's the dump for the L204WT from Moninfo...Monitor

Model name............... L204WTManufacturer............. LGEPlug and Play ID......... GSM4E48Serial number............ 341125Manufacture date......... 2007, ISO week 9-------------------------EDID revision............ 1.3Input signal type........ DigitalColor bit depth.......... UndefinedDisplay type............. RGB colorScreen size.............. 430 x 270 mm (20.0 in)Power management......... Standby, Suspend, Active off/sleepExtension blocs.......... None-------------------------DDC/CI................... SupportedMCCS revison............. 2.0Display technology....... TFTController............... Not supportedFirmware revision........ 0.1Firmware flags........... 0x68Active power on time..... Not supportedCurrent frequency........ Not supportedColor characteristicsDefault color space...... Non-sRGBDisplay gamma............ 2.20Red chromaticity......... Rx 0.651 - Ry 0.333Green chromaticity....... Gx 0.277 - Gy 0.614Blue chromaticity........ Bx 0.145 - By 0.082White point (default).... Wx 0.313 - Wy 0.329Additional descriptors... NoneTiming characteristicsHorizontal scan range.... 28-83kHzVertical scan range...... 56-75HzVideo bandwidth.......... 150MHzCVT standard............. Not supportedGTF standard............. Not supportedAdditional descriptors... NonePreferred timing......... YesNative/preferred timing.. 1680x1050p at 60Hz Modeline............... "1680x1050" 146.250 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsyncStandard timings supported720 x 400p at 70Hz - IBM VGA640 x 480p at 60Hz - IBM VGA640 x 480p at 75Hz - VESA800 x 600p at 56Hz - VESA800 x 600p at 60Hz - VESA800 x 600p at 75Hz - VESA832 x 624p at 75Hz - Apple Mac II1024 x 768p at 60Hz - VESA1024 x 768p at 75Hz - VESA1280 x 1024p at 75Hz - VESA1152 x 870p at 75Hz - Apple Mac II1280 x 1024p at 60Hz - VESA STD1280 x 960p at 60Hz - VESA STD1152 x 864p at 75Hz - VESA STDReport informationDate generated........... 10/07/2009Software revision........ 2.30.0.797Operating system......... 6.0.6001.2.Service Pack 1Raw data00,FF,FF,FF,FF,FF,FF,00,1E,6D,48,4E,85,34,05,00,09,11,01,03,EA,2B,1B,78,EA,D1,05,A6,55,47,9D,25,15,50,54,A7,6B,80,01,01,81,80,81,40,71,4F,01,01,01,01,01,01,01,01,21,39,90,30,62,1A,27,40,68,B0,36,00,B2,0E,11,00,00,1C,00,00,00,FD,00,38,4B,1C,53,0F,00,0A,20,20,20,20,20,20,00,00,00,FC,00,4C,32,30,34,57,54,0A,20,20,20,20,20,20,00,00,00,FC,00,0A,20,20,20,20,20,20,20,20,20,20,20,20,00,EDI'm hoping to get some support on this one... Dell support appears mostly useless.CheersBrad

[idata]

Ok... further development...

I've tried messing with the media accelerator settings... but it's no better.

I am getting the monitor OSD message saying the frequency is out of range. The manual recommends H-> 64.674 KHz and V-> 60.0 Hz. The specification says the range is H-> 28-83kHz, V-> 56-75Hz.

The thing that's weird is that the display doesn't go into standby... so it's obviously getting something from the display driver.

I'm not sure where to go from here. I think I'm going to print of a bunch of stuff and try and figure out if there's something in the registry I can tweak over the next few days.

[idata]

I WIN!

I've found the solution to my problem... I was using DVI-D Dual link cables. Took the monitors to a computer guy today for some back to back testing and to verify my problem... he tested my monitors with my leads and it totally failed exactly the same as on my computer at home.

Then he pulled out a single link DVI-D cable and PRESTO! Instant video at the correct resolution.

So it seems that while the dual link cable will tell the monitor to expect a picture, the picture goes missing along the way.

Anyway, solved my own problem... bought 3 x DVI-D single link cables and I have all three monitors working perfectly.