My best guess is that you are correct about the system compatibility being an issue. However, the MT and GT adapters are similar, so I am a little surprised that one would work and the other does not work.
I don't know what BIOS options you have available that might help you with different system resource allocations. Check might check for a plug and play OS option and try changing the setting. Sometimes you can change the setting for the speed on the PCI or PCI-x bus. You could experiment with different speeds to see if the adapter is detected.
Thx for your reply Mark. The bios of the old optiplex is wery limited and has not to many options - there is no plug & play option in the bios. I'm pretty shure that I has tried all bios options :-(
The Pro1000MT card that is working is pretty old and the Pro1000GT card is new ones ( I has tried 10 different new cards of the pro1000gt in four different optiplex GX1 with the same problem)
Maybe it has somthing to do with the PCI bus specification of the cards, old pci 2.0 compared to newer 2.2 ?. From what I can see on the diags report for the two types of cards when used in another pc is the memory resources that the cards claim.
I thought it could be worth a try to flash the bios with a COOREBOOT bios and see if that works but coorebot is new to me and I has not yet got the time to try. coorebot shouls support the old GX1. If there is no utility that makes it possible to change the resources beeing claimed by a pro1000gt card, coreboot will be the last option to try. /Petter
Can the EEUpdate.exe utility be used to try to modify the adapter to act the same way as the MT adapter ?. I found a quite interesting article:
http://blog.vodkamelone.de/archives/146-Unbricking-an-Intel-Pro1000-e1000-network-interface.html It seems to me that it should be possible to do some research and sort out this problem ??