When you say big and purchased, are we talking a 7026-H50, withdrawn from marketing in 2000? Do you actually have a licence to run AIX? It may come with the server, but it would be wise to check.
You are way back level of OS and possibly firmware too - just like me, I have four H70 and an M80 running AIX 4.3.3
Depending what graphics card you are trying to use, it may just be too new for the server firmware to deal with or the OS may not recognise it. You would be better using the serial console. You can buy the appropriate cable to connect a laptop if need be.
Of course, I may have misunderstood completely. You mention Remote Console, so is that via an HMC? If so, can you go to the real HMC and get the console working there? You have to enable remote console support on the HMC, but I've had lots of trouble with Java too.
Can you give more details of what you are getting/not getting and how you are attempting to do so.
Thanks, in advance,
Robin
Liverpool/Blackburn
UK