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Interior Systems, please do keep us updated if the mobo replacement will work. I'm leaning too towards the BIOS flash solution which would be quicker since I hear this issue has been rather common.
This will still most likely not work for you.
The issue with NICS's on the 755 is almost always resolved with the most recent BIOS flash, which was created *TO ADDRESS THE NIC ISSUES*. Your new board will most likely be the older BIOS as it has been on a shelf for a while. Yes, techs flash the svctag to the BIOS and will usually flash the BIOS if they have a more current version in the board kit; do not bet on it. Just run the BIOS update. It's dirt simple: Go to http://support.dell.com, select drivers, select Opti 755 as your model, go under BIOS, download the utility, run it, reboot. There you go.
Thanks xandraius, I will take it as an advise, I won't like seeing that message on my monitor againg lol. take care.
xandros is a good one too.
I am having the same problem with about 20 755s that I got from a company I recycle for.
I have disabled the MEBx and flashed the bios with the most recent BIOS update and still nothing. The NIC will not work in linux either.
I have tried everything I know and nothing has worked.
Any help would be greatly appreciated.