Cannot log into any GUI modes and need to reinstall OSX

Hi all,
I've been having issues with my iMac 27" i7 desktop which I purchased back in 2011 with OSX Lion.
I recently updated to OSX Mavericks and have some issues which I am trying to resolve.
I have been working through troubleshooting with the Apple Support team as it is still covered by the extended warranty that I purchased with the system.  Unfortunately it appears that we have come to the end of their technical support capabilities and I have no resolution.   Here is a quick breakdown of the situation:
While doing some gaming in a Bootcamp copy of Windows 7 the computer froze and displayed a green screen with vertical lines and was unresponsive.
Rebooted the machine into OSX Mavericks (upgraded about a month ago from Lion) and after the Apple symbol and loading wheel, when the machine went to display my desktop it froze with a completely white screen.
Tried to reboot back into Windows 7 and when it went to display the desktop it went to a grey screen with vertical lines.
Called the Apple Support line who advised me how to log into Safe Mode.   This worked ok and then I rebooted into OSX properly and my desktop displayed albeit running very slow.
Backed up my data and then while doing some web browsing the computer locked up and went to a blank screen.
Called the Apple Support line who took me into Recovery Mode and got me to Verify the Disk and Verify Disk Permissions.  Also advised me to run Apple Hardware Test.
Ran Apple Hardware Test and it said that there are "no problems"
Booted back into OSX which worked ok but still very slow.
During a data transfer the computer locked up with a black screen and the rainbow spinning wheel and was unresponsive.
After a few attempts I was able to log back in and complete my backup of crucial files.
Yesterday I went to boot the computer and it again gets to point after the Apple symbol and loading wheel where it would display my desktop and goes to blank screen.  Apple Support advised that the next step for testing purposes is to format the HDD and reinstall OSX.
No matter whether I am trying to boot into OSX, Safe Mode, Recovery Partition or Internet Recovery (I have tried all numerous times) whenever it gets to a point where the GUI would be displayed the machine locks up and I get a blank white screen.  I logged into Single-User Mode and ran a file system check which came up ok and I have run AHT again which came up ok as well, however considering that it doesn't matter where I boot to the same error occurs I believe that the issue is probably hardware related rather than software.  I have also followed the instructions to clear the PVRAM
I have booted to OSX using Verbose mode and noticed that there are a number of SMC errors and other messages indicating that there may be some software issues, so I am trying to troubleshoot those before I take the machine to the Authorised Apple Repair Centre
I have created an OSX Mavericks Boot USB but that comes up with a white screen as well if I boot to it.
I'm not sure if it will help, but I can select my recovery partition (OSX Base System) during boot and load into single user mode there.   I'm curious whether (and how) to run diskutils from there to verify disk and permissions for my primary partition (lets call it "Lion").  Then erase the disk and reinstall OSX from my boot USB.

You have to start the miniSAP instance before you can log in to it.
On your desk top there should be an icon 'start SAP WA1' start that, and leave the DOS window running until you are finished.
If you get messages in the DOS window saying processes died check that MS loopback is running.
MattG.

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