Intermittent Graphics Problem

I have an iMac from May 2011.
In the last week it has exhibited a very intermittent graphics problem.
I see that this model had a known graphics card issue and there is an extended 4 year warranty on it.
But it is so intermittent that I wonder if it is something else.
Running 10.9.4.
This started after I installed a free virus program (Webroot) from my online bank.
Probably a red herring but it made me think it was that.
I reformatted the drive and installed fresh not importing anything.
All was well for a few days.
Then it started again, the display goes blue or pink or sometimes black. Usually less than once a day but sometimes more.
It has never done it in bootcamp.
Today I booted from the install DVD and ran the extensive hardware test. Over an hour long and the iMac was very hot afterwards as expected.
It reported NO PROBLEMS.
I have an appointment Friday but it is 50 minutes one way and I am hesitant to go when I can't replicate it.
Anyone think of anything it could be?

Didn't you see that I reformatted the hard drive and installed fresh, that would solve any problems by antivirus right?
EtreCheck version: 1.9.15 (52)
Report generated September 2, 2014 at 3:59:13 PM EDT
Hardware Information: ?
iMac (27-inch, Mid 2011) (Verified)
iMac - model: iMac12,2
1 3.4 GHz Intel Core i7 CPU: 4 cores
16 GB RAM
Video Information: ?
AMD Radeon HD 6970M - VRAM: 1024 MB
iMac 2560 x 1440
System Software: ?
OS X 10.9.4 (13E28) - Uptime: 0 days 1:4:35
Disk Information: ?
WDC WD1001FALS-403AA0 disk1 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk1s1) <not mounted>: 209.7 MB
iMac 2 (disk1s2) /Volumes/iMac 2: 872.86 GB (183.05 GB free)
.BOOTCAMP (disk1s3) /Volumes/.BOOTCAMP: 127 GB (45.04 GB free)
M4-CT512M4SSD2 disk0 : (512.11 GB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted>: 209.7 MB
iMac (disk0s2) / [Startup]: 511.25 GB (112.31 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
OPTIARC DVD RW AD-5680H
USB Information: ?
Apple Inc. FaceTime HD Camera (Built-in)
Apple, Inc. Keyboard Hub
Apple, Inc Apple Keyboard
GenesysLogic USB2.0 Hub
GenesysLogic USB2.0 Hub
Apple Inc. iPhone
Alcor Micro Corp USB Card Reader
asus Nexus 7
Alcor Micro Corp USB Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Internal Memory Card Reader
Apple Computer, Inc. IR Receiver
Thunderbolt Information: ?
Apple Inc. thunderbolt_bus
Gatekeeper: ?
Mac App Store and identified developers
Launch Daemons: ?
[loaded] com.adobe.fpsaud.plist Support
[running] com.backblaze.bzserv.plist Support
[loaded] com.macpaw.CleanMyMac2.Agent.plist Support
User Launch Agents: ?
[running] com.backblaze.bzbmenu.plist Support
[loaded] com.google.keystone.agent.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.scheduledScan.plist Support
[loaded] com.macpaw.CleanMyMac2Helper.trashWatcher.plist Support
User Login Items: ?
iTunesHelper
ChronoSyncBackgrounder
Messages
Dropbox
TextExpander
Wunderlist
CopyLess
Alfred
Caffeine
Moom
Google Chrome
Calendar
Android File Transfer Agent
Internet Plug-ins: ?
FlashPlayer-10.6: Version: 14.0.0.176 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
Flash Player: Version: 14.0.0.176 - SDK 10.6 Support
Default Browser: Version: 537 - SDK 10.9
nplastpass: Version: 3.1.21 Support
GarminGpsControl: Version: 4.2.0.0 - SDK 10.8 Support
Silverlight: Version: 5.1.30514.0 - SDK 10.6 Support
SlingPlayer: Version: (null) - SDK 10.8 Support
Safari Extensions: ?
OpenIE
LastPass-2
Audio Plug-ins: ?
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins: ?
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
3rd Party Preference Panes: ?
Backblaze Backup Support
Flash Player Support
Time Machine: ?
Auto backup: YES
Volumes being backed up:
iMac: Disk size: 476.14 GB Disk used: 371.54 GB
Destinations:
TimeCapsule [Network] (Last used)
Total size: 2 TB
Total number of backups: 23
Oldest backup: 2014-08-24 06:22:12 +0000
Last backup: 2014-09-02 13:05:12 +0000
Size of backup disk: Excellent
Backup size 2 TB > (Disk size 476.14 GB X 3)
Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU: ?
      20% prl_vm_app
      8% WindowServer
      4% backupd
      3% diskimages-helper
      2% Google Chrome
Top Processes by Memory: ?
639 MB iTunes
426 MB prl_vm_app
311 MB com.apple.MediaLibraryService
279 MB prl_client_app
246 MB Google Chrome
Virtual Memory Information: ?
1.22 GB Free RAM
4.78 GB Active RAM
2.28 GB Inactive RAM
7.72 GB Wired RAM
3.05 GB Page-ins
0 B Page-outs

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I have repaired permissons, reset PRAM and using Disk Utility to repair the HD shows nothing wrong.
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