Hi Nick I am installing on high end workstation hard ware not the mac - Mac is my pc of choice for every day use. I am installing on an i7 with dedicated graphics 16gb RAM and onboard RAID. I have a Raid 1 setup. As per my accepted answer I installed in the low graphics mode under troubleshooting. Wish it wasn't quite as hidden might have given it a try much earlier in the day. The issue still remains that website is downloading the latest 7.4 iso but it is labelled as 7.3 and the checksum is in now way related to either the 7.3 or the 7.4 iso's. Seriously frustrating day today.