2405fpw DVI issues - corrupt EDID?

Question

Okay, here's the situation. I have a Gigabyte 7800GTX connected via DVI to a 24' Dell 2405FPW TFT.Yesterday I installed Win7 and everything went smoothly. After install Win7 detected the 7800GTX and set the res to the monitors native 1920x1200. This remained for a few hours until eventually I made the mistake of downloading the latest Win7 Nvidia drivers and installing them.After install my Dell was detected as a 'Generic NON PnP Monitor' and the maximum resolution I could select is 1024x768. I've tried rolling back the Nvidia drivers, installed the original MS ones, uninstalled the Nvidia software, tried new monitor drivers, different DVI cables, etc, etc. NOTHING resolves this issue.On top of that, whenever I now boot I no longer see my BIOS / POST screen unless I plug a different monitor in. For example, if I plug my spare Samsung in (via DVI) the POST screen appears on there, Winlogon will then appear on the Dell. No matter what I do I can't get the POST screen to show on my Dell. On top of this, Win7 will happily detect the Samsung and set it to its native res.So I Googled a bit and saw some other people with similar issues. I got a DVI > VGA Adapter and plugged that in my 7800 and into the Dell's VGA port. Windows correctly detects this as a 2405fpw and sets the native res as 1920x1200. If I unplug the VGA cable and plug the DVI one into it, Win7 detects it as 'Display Device on DVI' (no mention of Dell 2405fpw). I can also now select 1920x1200. Unfortunately, if I reboot it goes back to 1024x768 and won't go any higher which means I would have to constantly boot up in VGA, then switch the cables over. This, is not acceptable.To add further insult to injury, the Dell's DVI port now refuses to work on anything other than my Win7 machine. I plugged it into a WinXP machine and it just goes into sleep. The Dells VGA port works fine on the XP maxchine, but absolutely nothing at all shows up over the DVI connection. The mointor just says it's in 'sleep mode' and to move the mouse or press a key (which does nothing). Plug it back into the Win7 machine and it works (albeit at 1024x768) From what I can gather this is possibly a corrupt EDID, will I be able to fix this? My mate has the same monitor so I was going to ask him to get me the EDID using Phoenix EDID Designer, then write it with Powertstrip. I understand that Powerstrips 'write EDID' will tell me it's found an EEPROM on port 1 or 2. Which is the port for DVI? I'm assuming port 2? Thanks

DELL-Chris M · Answer

Try resetting it.* Power off the PC* Power off the monitor* Disconnect the power cord from the monitor* Disconnect all monitor cords from the PC video card* While disconnected, press and hold the monitor power button down for 3 seconds* Reconnect the DVI cord from the monitor to the PC video card* Reconnect the power cord to the monitor* Power on the monitor if it does not power on by itself* Power on the PC* Press the Input Source Select button and choose DVI

danmoz98 · Answer

I've tried all that multiple times. The VGA port is detected correctly. When plugged into the DVI port it's just showing as a 'Generic NON PnP monitor'.

Tried creating a custom monitor driver in Powerstrip and that's not working.

It's the EDID, it's screwed, I'm sure of it.

Chirs: If I use Powerstrip and 'Update EDID' after scanning it tells me "The existing ]UL0D0 EDID appears to have a corrupt header and checksumm. Click yes to correct the error".

If I try to fix it it says it can't because the EDID is either write protected or the cable is too long. I notice my cable is singl link, would this be why?

This was a perfectly good monitor before I installed those drivers the other day and using VGA is already giving me headaches. Is this something I can repair myself? Or is the EEPROM write protected? And if so, is this something I can get repaired relatively cheap? The monitor was bought sometime in 2005 (Mfg date is week 34 2005), possibly 2006 so well out of warranty.

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