IMac hard drive refuses to sleep

Hi
I have spent most of the morning trying - and failing - to persuade my late 2012 2.7ghz 21.5" iMac to sleep correctly. Running Yosemite 10.10.1, entering sleep mode turns off the display but the hard drive continues to whirr away continuously. I have tried the following: SMC reset, NVRAM reset, verify and repair disc permissions, creating a guest account and logging into that (problem still there), using Activity Monitor to close down all system and application activity, checking all energy saving and bluetooth settings, turning off file sharing, turning off iCloud drive, powering up in safe mode.
Nothing seems to work. If there's anyone with an idea - or suggestions of something I've missed - then I would be hugely grateful!
Many thanks in advance.

Problem description:
Hard drive won’t sleep
EtreCheck version: 2.1.5 (108)
Report generated 26 December 2014 15:30:49 GMT
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
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 10.10.1 (14B25) - Uptime: 0:13:9
Disk Information: ℹ️
APPLE HDD HTSdisk0 : (1 TB)
EFI (disk0s1) <not mounted> : 210 MB
Macintosh HD (disk0s2) / : 999.35 GB (544.48 GB free)
Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
USB Information: ℹ️
Apple Inc. FaceTime HD Camera (Built-in)
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
Mac App Store and identified developers
Kernel Extensions: ℹ️
/System/Library/Extensions
[not loaded] com.symantec.kext.symdc (1.6) [Support]
[not loaded] com.tomtom.driver.UsbEthernetGadget (1.0.0d1) [Support]
Startup Items: ℹ️
HP Trap Monitor: Path: /Library/StartupItems/HP Trap Monitor
NortonAutoProtect: Path: /Library/StartupItems/NortonAutoProtect
NortonMissedTasks: Path: /Library/StartupItems/NortonMissedTasks
NUMCompatibilityCheck: Path: /Library/StartupItems/NUMCompatibilityCheck
SymDCInit: Path: /Library/StartupItems/SymDCInit
TrackDelete: Path: /Library/StartupItems/TrackDelete
VolumeAssist: Path: /Library/StartupItems/VolumeAssist
Startup items are obsolete in OS X Yosemite
Launch Daemons: ℹ️
[loaded] com.adobe.fpsaud.plist [Support]
User Launch Agents: ℹ️
[invalid?] com.amazon.cloud-player.plist [Support]
[running] com.amazon.music.plist [Support]
[loaded] com.google.keystone.agent.plist [Support]
[running] com.spotify.webhelper.plist [Support]
User Login Items: ℹ️
iTunesHelper Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
Internet Plug-ins: ℹ️
Google Earth Web Plug-in: Version: 6.1 [Support]
Default Browser: Version: 600 - SDK 10.10
Flip4Mac WMV Plugin: Version: 2.3.0.14 [Support]
npBTEmailConfig: Version: 1.0 [Support]
OfficeLiveBrowserPlugin: Version: 12.3.6 [Support]
Silverlight: Version: 5.1.20913.0 - SDK 10.6 [Support]
FlashPlayer-10.6: Version: 16.0.0.235 - SDK 10.6 [Support]
AmazonMP3DownloaderPlugin101749: Version: AmazonMP3DownloaderPlugin 1.0.17 - SDK 10.4 [Support]
Flash Player: Version: 16.0.0.235 - SDK 10.6 [Support]
iPhotoPhotocast: Version: 6.0
QuickTime Plugin: Version: 7.7.3
DirectorShockwave: Version: 12.1.1r151 - SDK 10.6 [Support]
Safari Extensions: ℹ️
AllMyTube [Installed]
Add To Amazon Wish List [Installed]
3rd Party Preference Panes: ℹ️
Flash Player [Support]
Flip4Mac WMV [Support]
StuffIt AVR [Support]
Time Machine: ℹ️
Skip System Files: NO
Mobile backups: OFF
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 999.35 GB Disk used: 454.87 GB
Destinations:
Untitled [Local]
Total size: 499.06 GB
Total number of backups: 4
Oldest backup: 2014-09-17 00:39:05 +0000
Last backup: 2014-09-17 08:33:29 +0000
Size of backup disk: Too small
Backup size 499.06 GB < (Disk used 454.87 GB X 3)
Top Processes by CPU: ℹ️
      6% WindowServer
      2% com.apple.WebKit.WebContent
      0% Dock
      0% hidd
      0% fontd
Top Processes by Memory: ℹ️
283 MB com.apple.WebKit.WebContent
137 MB mds_stores
137 MB Safari
103 MB WindowServer
86 MB CalendarAgent
Virtual Memory Information: ℹ️
3.16 GB Free RAM
3.65 GB Active RAM
885 MB Inactive RAM
882 MB Wired RAM
2.07 GB Page-ins
0 B Page-outs
Diagnostics Information: ℹ️
Dec 26, 2014, 03:18:13 PM Self test - passed
Dec 24, 2014, 12:36:13 PM /Library/Logs/DiagnosticReports/Aperture_2014-12-24-123613_[redacted].hang
Dec 24, 2014, 12:15:37 PM /Library/Logs/DiagnosticReports/locationd_2014-12-24-121537_[redacted].crash
Dec 24, 2014, 11:38:37 AM /Library/Logs/DiagnosticReports/locationd_2014-12-24-113837_[redacted].crash
Dec 24, 2014, 10:47:47 AM /Users/[redacted]/Library/Logs/DiagnosticReports/FaceTime_2014-12-24-104747_[re dacted].crash
Dec 24, 2014, 10:45:57 AM /Users/[redacted]/Library/Logs/DiagnosticReports/FaceTime_2014-12-24-104557_[re dacted].crash
Dec 24, 2014, 10:45:18 AM /Users/[redacted]/Library/Logs/DiagnosticReports/FaceTime_2014-12-24-104518_[re dacted].crash
Dec 24, 2014, 09:21:06 AM /Library/Logs/DiagnosticReports/Google Drive_2014-12-24-092106_[redacted].crash
Dec 24, 2014, 09:17:21 AM /Library/Logs/DiagnosticReports/Google Drive_2014-12-24-091721_[redacted].crash

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VIN,IMAC (20-INCH LATE 2006)
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Model Name: iMac
Model Identifier:    iMac5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
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Total Number Of Cores: 2
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3.5" SATA
7200RPM
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people's responses to: Need to replace my late 2006 imac hard drive - what should i be looking for to replace it?
1. You can use any 3.5" Sata drive, WD or Seagate would be good choices.
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http://www.youtube.com/watch?v=ShY8zuT-wPg&feature=player_embedded
http://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2105+and+2118+Hard+Drive+Repl acement/1092/1
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<Edited by Host>

thanks for the quick reply kappy,
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Interface (32)
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http://www.frys.com/search?cat=-69564&pType=pDisplay&fq=100413%203.5-100415%2072 00
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Checking catalog file.
Keys out of order
Invalid extent entry
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Missing thread record (id = 82)
Incorrect size for file iNode78591999
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Invalid extent entry
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Missing thread record (id = 18)
Invalid extent entry
Invalid extent entry
Invalid extent entry
Incorrect block count for file iNo$e78592002
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Missing thread record (id = 82)
Invalid extent entry
Incorrect size for file iN/de7x592003
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Invalid extent entry
File record has hard link chain flag (id = 78592067)
File has incorrect number of links (id = 78592067)
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Missing thread record (id = 4194322)
Invalid extent entry
Invalid extent entry
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File has incorrect number of links (id = 78592004)
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Missing thread record (id = 18)
Incorrect size for file iNode78592005
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Invalid extent entryIncorrect size for file iNode78592006
(It should be 0 instead of 4194304)
Invalid extent entry
Invalid extent entry
Missing thread record (id = 4194322)
Invalid extent entry
Invalid extent entry
File record has hard link chain flag (id = 82786312)
File has incorrect number of links (id = 82786312)
(It should be 1 instead of 17)
Missing thread record (id = 18)
Incorrect block count for file )Nod%78592009
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Invalid extent entry
Invalid extent entry
Incorrect block count for file iNode78592010
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Invalid extent entry
Incorrect size for file iNode78592011
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Invalid catalog record type
The volume Time Machine could not be verified completely.
Error: This disk needs to be repaired. Click Repair Disk.
Whilst pondering this, the hard drive crashed again this week. Bizarrely I was able to restore from the very same external TM that will not let me do further back ups nor be repaired.
I wonder if there are any further checks I can do to establish if my iMac hard drive is failing? I will then decide whether to replace the hard drive - I see I can fit a WD 6TB with the jumpers set to reduce the speed to 3GB/s - or buy a new iMac.
I wonder also whether there is anything I can do to preserve my TM back ups. I realise I am being guided to re-format this external drive, but can I do that and then add back the actual existing back ups (which I would transfer to another disk before re-formatting) rather than start again from no history newly formatted?

Omdineen wrote:
It boots up to where its just my background and the Finder bar but then crashes, so I can't click anything. Anything from here or am I just screwed?
There are a few remaining options.
If you have another Mac with a FireWire port, try FireWire Target Disk Mode: http://support.apple.com/kb/HT1661
You need a FireWire cable to connect the two Macs. This will allow you to mount your failing HD on a working Mac and copy files that way.
Try Safe Mode - read about it first:
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components.
Starting up in Safe Mode
This assumes the Finder is crashing due to a third party system extension or optional system component that Safe Mode will prevent from loading. You should still be able to copy files directly to an external device, but file sharing will be disabled.
Lastly boot from the DVD again, repair the disk again, reinstall OS X, and keep your fingers crossed. You're squeezing the last drops of life from the thing.

IMac hard drive refuses to sleep

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