Problem starting iMac on Yosemite

Hi, yesterday I installed Yosemite on my iMac 2.7 GHz Intel Core i5.
All was well yesterday, turned the mac off last night and back on again this morning to be presented with a white screen, Apple logo and a loading bar which gets to about a third of the way across and then stops.
Sometime the loading bar gets a little further and then stops and the pointer turns into a colour wheel.
After multiple attempts to start it finally completed loading and I got to my desktop.
I shut down and started up again to check it was just a glitch and had the same problem again.
After many re-starts I have finally got back up and running but obviously I don't want to shut down again until I find a solution.
I installed EtreCheck and got it to create a report:
EtreCheck version: 2.0.6 (91)
Report generated 23 October 2014 12:23:00 BST
Hardware Information: ℹ️
iMac (21.5-inch, Late 2012) (Verified)
iMac - model: iMac13,1
1 2.7 GHz Intel Core i5 CPU: 4-core
8 GB RAM Upgradeable
BANK 0/DIMM0
4 GB DDR3 1600 MHz ok
BANK 1/DIMM0
4 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en1: 802.11 a/b/g/n
Video Information: ℹ️
NVIDIA GeForce GT 640M - VRAM: 512 MB
iMac 1920 x 1080
System Software: ℹ️
OS X 10.10 (14A389) - Uptime: 0:19:44
Disk Information: ℹ️
APPLE HDD HTS541010A9E662 disk0 : (1 TB)
S.M.A.R.T. Status: Verified
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / [Startup]: 999.35 GB (943.73 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. FaceTime HD Camera (Built-in)
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Launch Agents: ℹ️
[loaded] com.epson.ews.launcher.plist Support
[running] com.kodak.BonjourAgent.plist Support
[running] com.mcafee.menulet.plist Support
[running] com.mcafee.reporter.plist Support
Launch Daemons: ℹ️
[invalid?] com.mcafee.ssm.ScanFactory.plist Support
[invalid?] com.mcafee.ssm.ScanManager.plist Support
[running] com.mcafee.virusscan.fmpd.plist Support
User Launch Agents: ℹ️
[loaded] com.adobe.ARM.[...].plist Support
[running] com.f-secure.sync.BTCloud.plist Support
[loaded] com.google.keystone.agent.plist Support
[loaded] com.kodak.KODAK AiO Annual Opt.plist Support
[loaded] com.kodak.KODAK AiO Firmware Updater.plist Support
[loaded] com.kodak.KODAK AiO Software Updater.plist Support
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
BT Cloud Application (/Applications/BT Cloud.app)
Internet Plug-ins: ℹ️
AdobePDFViewerNPAPI: Version: 11.0.09 - SDK 10.6 Support
Silverlight: Version: 5.1.30317.0 - SDK 10.6 Support
AdobePDFViewer: Version: 11.0.09 - SDK 10.6 Support
QuickTime Plugin: Version: 7.7.3
SiteAdvisor: Version: 2.0 - SDK 10.1 Support
Default Browser: Version: 600 - SDK 10.10
Safari Extensions: ℹ️
SiteAdvisor
3rd Party Preference Panes: ℹ️
None
Time Machine: ℹ️
Time Machine not configured!
Top Processes by CPU: ℹ️
      3% WindowServer
      0% fontd
      0% Google Chrome
      0% mds_stores
      0% AppleSpell
Top Processes by Memory: ℹ️
119 MB BT Cloud
112 MB Google Chrome
77 MB ocspd
77 MB VShieldScanner
69 MB Mail
Virtual Memory Information: ℹ️
4.87 GB Free RAM
2.07 GB Active RAM
797 MB Inactive RAM
854 MB Wired RAM
1.60 GB Page-ins
0 B Page-outs
Can anyone offer any help with this issue please ?

Hi ..
"presented with a white screen, Apple logo and a loading bar which gets to about a third of the way across and then stops.
Sometime the loading bar gets a little further and then stops and the pointer turns into a colour wheel. After multiple attempts to start it finally completed loading and I got to my desktop. I shut down and started up again to check it was just a glitch and had the same problem again."
Uninstall the Mcafee security software > How To Completely Uninstall Software under Mac OS X [MacRx] | Cult of Mac
It's not necessary on a Mac.

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