IMac Mid 2007 (OS X Mavericks 10.9.4) doesn't go to sleep

Hello, i have an issue with my iMac Mid 2007 with OS X Mavericks :
On my primary account my mac never goes to sleep even if there is no app open or itunes or spotify playing.
I've tried to disable everything and restore energy savings default but didn't work
I've done a SMC reset e PRAM reset, no change.
On a partition with yosemite public beta it sleeps normally and in bootcamp partition i didn't check but i think it goes to sleep.
If i use another account with Mavericks it goes to sleep as well so there should be something wrong with my account or some app installed...
I did not install anything new recently, only chrome beta 64bit.
I have an SSD on this iMac and 6Gb of ram... i thought the problem was spotify but even if uninstalled it doesn't sleep.
pmset -g assertionts in terminal gives :
13/09/14 08:36:20 CEST
Assertion status system-wide:
   BackgroundTask                 1
   PreventDiskIdle                0
   ApplePushServiceTask           0
   UserIsActive                   0
   PreventUserIdleDisplaySleep    0
   InteractivePushServiceTask     0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     1
   NetworkClientActive            0
Listed by owning process:
   pid 280(coreaudiod): [0x0000000100000166] 01:35:21 NoIdleSleepAssertion named: "com.apple.audio.'AppleHDAEngineInput:1B,0,1,0:1'.noidlesleep"
   pid 88(apsd): [0x0000000c00000309] 00:00:02 ApplePushServiceTask named: "com.apple.apsd-recreatecachedictionaries-push.apple.com"
Kernel Assertions: 0x4=USB
   id=500 level=255 0x4=USB mod=13/09/14 07:01 description=EHC1 owner=AppleUSBEHCI
   id=501 level=255 0x4=USB mod=13/09/14 07:01 description=EHC2 owner=AppleUSBEHCI
   id=504 level=255 0x4=USB mod=13/09/14 07:06 description=UHC3 owner=AppleUSBUHCI
   id=506 level=255 0x4=USB mod=13/09/14 07:07 description=UHC4 owner=AppleUSBUHCI
It seems there is always a process with coreaudio that prevents system from sleep.
Do i need to reinstall os x mavericks again?
I have another issue too regarding the image file preview, usually are shown but sometimes when i reboot or start my mac previews are not shown and i have to check in the finder option "Show file preview" again to get it right...
Thanks in advance

No i've checked that before posting and i did all that steps... anyway i think i resolved my issue...
Even reinstalling mavericks didn't fix the issue, so i installed yosemite public beta 3 on my primary partition and that still didn't fix the problem with coreaudio...
Anyway i unloaded coreaudiod
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist
In Finder i moved to /System/Library/LaunchDaemons and moved to Desktop com.apple.audio.coreaudiod.plist
After reboot there was no audio and no coreaudiod process preventing sleep of course so i moved back coreaudiod.plist to /System/Library/LaunchDaemons
and
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist
This enabled the audio and now in terminal pmset -g assertions shows :
2014-09-16 23:27:03 +0200
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   0
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   ExternalMedia                  1
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Listed by owning process:
   pid 29(powerd): [0x000000120008012c] 00:07:45 ExternalMedia named: "com.apple.powermanagement.externalmediamounted"
Kernel Assertions: 0x4=USB
   id=500 level=255 0x4=USB mod=16/09/14 23:19 description=EHC1 owner=AppleUSBEHCI
   id=501 level=255 0x4=USB mod=16/09/14 23:19 description=EHC2 owner=AppleUSBEHCI
   id=503 level=255 0x4=USB mod=16/09/14 23:27 description=UHC3 owner=AppleUSBUHCI
   id=505 level=255 0x4=USB mod=16/09/14 23:24 description=UHC4 owner=AppleUSBUHCI
That is quite normal and this way my mac goes to sleep...
I'll check if it's the latest installation of spotify causing this issue...
Thanks for the reply.

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Isnt line in just a fancy word for a plug that looks like headphones?
No. The term "line in" refers to the signal level the input can accept. It has nothing to do with the type of socket/plug.
I just checked what Line in is and i do have a line in spot in my mac. So why would i need to buy the IMic?
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My personal preference for you is to purchase a OS X 10.6 Snow Leopard install disc, then update to OS X 10.6.8 and STAY THERE!
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Purchased Installer disc here.
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard
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iMac (Mid-2007 or later)
MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
MacBook Pro (13-inch, Mid-2009 or later),
MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
MacBook Air (Late 2008 or later)
Mac mini (Early 2009 or later)
Mac Pro (Early 2008 or later)
Xserve (Early 2009)
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2 GB or more of memory (I strongly advise, at least, 4 GBs of RAM or more)
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