Yep it's a 7,3 machine not 7,5 my bad
I actually now have the G5 working. I think the issue was I had the main partition as FFS. So I blitzed the system. This time split the partition in two and formatted them as SFS. It seems to have got rid of most of my issues.
E-UAE and Poly Organiser are now working.
I managed to get the Wireless working, by setting the DNS servers to OpenDNS. However it refuses to work after about 30 seconds. Even though the card is connected the transfer of data seems to freeze and no longer work.
Will have to try Ethernet.
Sound seems to be more stable too. I think my system was just playing silly buggers