You could have the same issue I had lately, so here it goes:
- I installed svethlana some time ago and it worked perfectly ( sent many files through svethlana )
- few days ago I had some big files to sent to my CT monster so powered it and I had no connection ( both lights on when cable connected ), so I checked configuration on MiNT and Ubuntu zybelion times and all seemed OK
- by some coincidence

I touched the ribbon cable and find out that pings started going so finally I set the ribbon the way that it works flawlessly
( of course I need to take this out and see whats wrong with this ribbon, but I did not find enough power in me to take all this out off my tower construction yet

)