Time Machine not speaking to my Mac (error message -6753)

My time machine has stopped backing up and when I try to reconnect Time Capsule gets the connect messages but will not respond, except with error messages saying it is not available.
1. Airport Utility recognises that the Time Capsule hard drive exists but will not do a manual or auto configuration.
2. Time Machine app does list the Time Capsule ("Data" on "Time Capsule") in the "Select backup disk..." but does not display the amount of Gb available though it does with the other disks listed - these are all FireWire connected, while Time Capsule is connected via Ethernet (which I prefer to AirPort).
3. Have tried deleting the plist, but this has not solved the problem.
4. Have looked at the help lists tried a few other thing but nothing works (including changing from Ethernet to AirPort). I have searched online for error -6753, but get 0 results.
5. I have done a few screen shots but it seems I cannot attach files
Since I cannot put my screenshots online, here is a line from NetBarrier indicating that my Mac is connecting to Time Capsule:
18/02/2010, 16:50:02
Source: 192.168.1.64
Destination: 169.254.141.19
Protocol: TCP
Src Port: 51942
Destination Port: 5009
Flags: S
Interface: en0
Kind: Outgoing connection
I feel my description of the problem is rather inadequate, so if anyone feels they could help if I provided more info then please ask me.
Thanks for any help.

Forgot to mention that the light is green on my Time Capsule and all the lights with the cables are also green.

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