Thanks for your help, Kees

Don't think this is a hardware problem... it works fine if I throw it in my other machine which is running, erm... that other popular operating system
I disabled a few things in my bios to try and free up any IRQ's etc that didn't really need to be used. Dmesg now tells me this:
ISDN subsystem Rev: 1.114.6.7/1.94/1.140.6.3/1.85.6.2/1.21/1.5.6.2 loaded
HiSax: Linux Driver for passive ISDN cards
HiSax: Version 3.5 (module)
HiSax: Layer1 Revision 2.41.6.1
HiSax: Layer2 Revision 2.25
HiSax: TeiMgr Revision 2.17
HiSax: Layer3 Revision 2.17.6.1
HiSax: LinkLayer Revision 2.51
HiSax: Approval certification failed because of
HiSax: unauthorized source code changes <----- ???????????
HiSax: Total 1 card defined
HiSax: Card 1 Protocol EDSS1 Id=HiSax (0)
HiSax: Eicon.Diehl Diva driver Rev. 1.25.6.3
Diva: No PCI card found
HiSax: Card Eicon.Diehl Diva not installed !
ISDN-subsystem unloaded
so it doesn't seem to know about my card, which is an eicon diva 2.02
Apparantly (after searching about the web for info) recognition of this card wasnt built into the linux kernel until version 2.2.5, so perhaps i should upgrade it... seems a bit of a major operation tho...
Can anyone offer any further advice?
Kif