Yosemite grey screen/restart loop- Mac Pro

Hi - I am trying to instal a fresh copy of Yosemite onto a new SSD in my Mac Pro 2009 and cannot get it to complete the installation. I am currently running Mavericks 10.9.4 from the stock HDD.
I have carefully followed steps to format the new SSD drive using Mac OS Journaled with a single GUID Partition.
I have tried two types of instal:
1. From a Bootable USB stick - created by Disk Maker X
The instal goes though initialisation, then the timed instal screen stage (which it completes), then it reboots to a grey screen (completely blank). It sits there for a few mins and eventually I hear the disks starting up and it boots straight into Mavericks.
2. Via the Yosemite installer straight from Mavericks. It lets you choose a destination drive, so I select the SSD, it does it's thing but after the first reboot just goes right back to the very first installation screen....
Any help gratefully received.
Thanks

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