After Yosemite update, iTunes recognizes but won't play songs

Hey guys,
I updated to Yosemite today. Things are still groggy but generally good...except for iTunes 12.0.1.26
The library loads and can find my songs but they won't play. I've tried several different methods to play tracks but nothing appears to happening. It goes into a play state at 0:00 in the song but won't advance.
I don't see mention so far of other users struggling, but I hope you can help.
iMac 24-inch Early 2009 model.

I called Apple Care. The tech said the problem was not common and the symptoms seemed to require a PRAM reset. So that's what we did.
To do the PRAM Rest, on reboot, hold:
⌘ + ⌥ + P + R
The computer will do its startup chime twice...like its rebooting each time. After that, it took a little extra time to reboot and then worked smoothly.
I did still have a few weird anomalies...
1 - Airplay in iTunes defaulted on...I had to turn it back off
2 - Airplay was selected as the default in System Settings too...
I had to turn off Airplay in iTunes and select Headphone out in System Settings > Sound but now everything seems to be in order.

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Hello Hannah and anyone else who has this problem. I had the same issue and it was very annoying, because I was also told it was an authorization issue. So I deauthorized and reauthorized multiple times, restarted my computer, tried to play in SD instead of HD, set the settings to 32bit and all that. Sadly but fortunately it was just a small issue. Go to Finder, click on go to folder and type "/Users/Shared/SC Info"
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Here is the link: http://support.apple.com/kb/ts1389?viewlocale=en_US
The link might look unrelated to the issue, because it does not specifically come up when Googling or searching support for this error.
BTW AppleCare gave me this information. They were awesome because they continued to call me and update me on their efforts to solve the issue. The engineers ultimately figured it out and the customer care person called me and walked me through it.
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Here's a link to a recent thread where lots of people had the same problem. See if any of these recommendations work:
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Message was edited by: masweet

Hello masweet,
And welcome to Apple Discussions!
The songs are probably greyed out because you have the iPod set up to "automatically" sync from your iTunes library. In order to play the songs from within iTunes off the iPod is to enable the "manually manage music and videos" button from under the iPod's Summary tab in iTunes. If you had previously set your iPod up for manual management, the update may have reverted it to automatic. So it will be as simple as changing it back.
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If you connect the iPod to another computer does iTunes not see it?
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Syncing to a "New" Computer or replacing a "crashed" Hard Drive: Apple Support Communities
For the enugh space, you are trying to sync too much media to the iPhone

Usb port not working after yosemite update please help

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Anonymous UUID:
CCC4DCA9-48E9-4692-250B-488588FCC69E
Sun Nov 9 17:58:17 2014
*** Panic Report ***
panic(cpu 0 caller 0xffffff802a005eb2): "Possible memory corruption: pmap_pv_remove(0xffffff803b8db998,0x7fff7360f000,0x6d654, 0x6d654d64, 0xffffff8031663cc4, 0xfffffeb38ae0f078): null pv_list!"@/SourceCache/xnu/xnu-2782.1.97/osfmk/i386/pmap_internal.h:768
Backtrace (CPU 0), Frame : Return Address
0xffffff8031663b80 : 0xffffff8029f3a811
0xffffff8031663c00 : 0xffffff802a005eb2
0xffffff8031663cf0 : 0xffffff802a0065e5
0xffffff8031663d50 : 0xffffff8029fb6b4a
0xffffff8031663e60 : 0xffffff8029facd2c
0xffffff8031663e90 : 0xffffff8029f5c747
0xffffff8031663ed0 : 0xffffff802a3c45ff
0xffffff8031663f40 : 0xffffff802a3c425c
0xffffff8031663f50 : 0xffffff802a44dcb2
0xffffff8031663fb0 : 0xffffff802a03ac46
BSD process name corresponding to current thread: suhelperd
Mac OS version:
14A389
Kernel version:
Darwin Kernel Version 14.0.0: Fri Sep 19 00:26:44 PDT 2014; root:xnu-2782.1.97~2/RELEASE_X86_64
Kernel UUID: 89E10306-BC78-3A3B-955C-7C4922577E61
Kernel slide:
0x0000000029c00000
Kernel text base: 0xffffff8029e00000
__HIB text base: 0xffffff8029d00000
System model name: MacBookPro8,1 (Mac-94245B3640C91C81)
System uptime in nanoseconds: 7052072843826
last loaded kext at 6483411185500: com.huawei.driver.HuaweiDataCardActivateDriver    1.0.12 (addr 0xffffff7fac6ba000, size 16384)
last unloaded kext at 6604174049015: com.apple.driver.AppleUSBCDC    4.2.2b5 (addr 0xffffff7fac717000, size 16384)
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com.huawei.driver.cdc_ncm    2.7.2f16
com.huawei.driver.dc_net    1.0.2
com.huawei.driver.cdc_acm    2.6.2f17
com.huawei.driver.cdc_usb_bus    1.0.3
com.huawei.driver.HuaweiDataCardDriver    4.25.45
com.apple.driver.AppleHWSensor    1.9.5d0
com.apple.driver.AudioAUUC    1.70
com.apple.driver.AGPM    100.14.37
com.apple.filesystems.autofs    3.0
com.apple.iokit.IOBluetoothSerialManager    4.3.0f10
com.apple.driver.AppleOSXWatchdog    1
com.apple.driver.AppleMikeyHIDDriver    124
com.apple.driver.AppleHDA    266.5
com.apple.driver.AppleMikeyDriver    266.5
com.apple.driver.AppleSMCLMU    2.0.4d1
com.apple.driver.ApplePolicyControl    3.7.21
com.apple.driver.AppleLPC    1.7.3
com.apple.driver.AppleUpstreamUserClient    3.6.1
com.apple.iokit.IOUserEthernet    1.0.1
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.driver.AppleHWAccess    1
com.apple.driver.AppleHV    1
com.apple.driver.ACPI_SMC_PlatformPlugin    1.0.0
com.apple.driver.AppleIntelHD3000Graphics    10.0.0
com.apple.driver.AppleIntelSNBGraphicsFB    10.0.0
com.apple.driver.AppleBacklight    170.4.12
com.apple.driver.AppleMCCSControl    1.2.10
com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport    4.3.0f10
com.apple.driver.AppleSMCPDRC    1.0.0
com.apple.driver.AppleThunderboltIP    2.0.2
com.apple.driver.SMCMotionSensor    3.0.4d1
com.apple.driver.AppleUSBTCButtons    240.2
com.apple.driver.AppleUSBTCKeyboard    240.2
com.apple.driver.AppleIRController    327.5
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless    1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.BootCache    35
com.apple.iokit.SCSITaskUserClient    3.7.0
com.apple.driver.XsanFilter    404
com.apple.iokit.IOAHCIBlockStorage    2.6.5
com.apple.driver.AppleUSBHub    705.4.1
com.apple.iokit.AppleBCM5701Ethernet    10.1.2b3
com.apple.driver.AppleFWOHCI    5.5.2
com.apple.driver.AppleSDXC    1.6.5
com.apple.driver.AirPort.Brcm4331    800.20.24
com.apple.driver.AppleAHCIPort    3.0.7
com.apple.driver.AppleUSBEHCI    705.4.14
com.apple.driver.AppleSmartBatteryManager    161.0.0
com.apple.driver.AppleRTC    2.0
com.apple.driver.AppleACPIButtons    3.1
com.apple.driver.AppleHPET    1.8
com.apple.driver.AppleSMBIOS    2.1
com.apple.driver.AppleACPIEC    3.1
com.apple.driver.AppleAPIC    1.7
com.apple.driver.AppleIntelCPUPowerManagementClient    218.0.0
com.apple.nke.applicationfirewall    161
com.apple.security.quarantine    3
com.apple.security.TMSafetyNet    8
com.apple.driver.AppleIntelCPUPowerManagement    218.0.0
com.apple.iokit.IOSCSIBlockCommandsDevice    3.7.0
com.apple.iokit.IOUSBMassStorageClass    3.7.0
com.apple.AppleGraphicsDeviceControl    3.7.21
com.apple.kext.triggers    1.0
com.apple.iokit.IOSerialFamily    11
com.apple.driver.DspFuncLib    266.5
com.apple.kext.OSvKernDSPLib    1.15
com.apple.iokit.IOAudioFamily    200.6
com.apple.vecLib.kext    1.2.0
com.apple.driver.AppleHDAController    266.5
com.apple.iokit.IOHDAFamily    266.5
com.apple.iokit.IOFireWireIP    2.2.6
com.apple.driver.AppleSMBusPCI    1.0.12d1
com.apple.iokit.IOSurface    97
com.apple.driver.IOPlatformPluginLegacy    1.0.0
com.apple.driver.AppleGraphicsControl    3.7.21
com.apple.driver.AppleBacklightExpert    1.1.0
com.apple.iokit.IONDRVSupport    2.4.1
com.apple.driver.AppleSMBusController    1.0.13d1
com.apple.iokit.IOGraphicsFamily    2.4.1
com.apple.iokit.IOBluetoothHostControllerUSBTransport    4.3.0f10
com.apple.iokit.IOBluetoothFamily    4.3.0f10
com.apple.driver.IOPlatformPluginFamily    5.8.0d49
com.apple.iokit.IOUSBUserClient    705.4.0
com.apple.driver.AppleSMC    3.1.9
com.apple.driver.AppleUSBMultitouch    245.2
com.apple.iokit.IOUSBHIDDriver    705.4.0
com.apple.driver.AppleUSBMergeNub    705.4.0
com.apple.driver.AppleUSBComposite    705.4.9
com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.7.0
com.apple.iokit.IOBDStorageFamily    1.7
com.apple.iokit.IODVDStorageFamily    1.7.1
com.apple.iokit.IOCDStorageFamily    1.7.1
com.apple.iokit.IOAHCISerialATAPI    2.6.1
com.apple.iokit.IOSCSIArchitectureModelFamily    3.7.0
com.apple.driver.AppleThunderboltNHI    3.1.7
com.apple.iokit.IOThunderboltFamily    4.2.1
com.apple.iokit.IOEthernetAVBController    1.0.3b3
com.apple.iokit.IOFireWireFamily    4.5.6
com.apple.iokit.IO80211Family    700.52
com.apple.driver.mDNSOffloadUserClient    1.0.1b8
com.apple.iokit.IONetworkingFamily    3.2
com.apple.iokit.IOAHCIFamily    2.7.0
com.apple.iokit.IOUSBFamily    705.4.14
com.apple.driver.AppleEFINVRAM    2.0
com.apple.driver.AppleEFIRuntime    2.0
com.apple.iokit.IOHIDFamily    2.0.0
com.apple.iokit.IOSMBusFamily    1.1
com.apple.security.sandbox    300.0
com.apple.kext.AppleMatch    1.0.0d1
com.apple.driver.AppleKeyStore    2
com.apple.driver.AppleMobileFileIntegrity    1.0.5
com.apple.driver.AppleCredentialManager    1.0
com.apple.driver.DiskImages    389.1
com.apple.iokit.IOStorageFamily    2.0
com.apple.iokit.IOReportFamily    31
com.apple.driver.AppleFDEKeyStore    28.30
com.apple.driver.AppleACPIPlatform    3.1
com.apple.iokit.IOPCIFamily    2.9
com.apple.iokit.IOACPIFamily    1.4
com.apple.kec.corecrypto    1.0
com.apple.kec.Libm    1
com.apple.kec.pthread    1
Model: MacBookPro8,1, BootROM MBP81.0047.B04, 2 processors, Intel Core i5, 2.3 GHz, 4 GB, SMC 1.68f96
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xD6), Broadcom BCM43xx 1.0 (5.106.98.100.24)
Bluetooth: Version 4.3.0f10 14890, 3 services, 19 devices, 2 incoming serial ports
Serial ATA Device: ST9320325ASG, 320.07 GB
Serial ATA Device: HL-DT-ST DVDRW GS31N
USB Device: Hub
USB Device: HUAWEI Mobile
USB Device: IR Receiver
USB Device: FaceTime HD Camera (Built-in)
USB Device: Hub
USB Device: BRCM2070 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Apple Internal Keyboard / Trackpad
Thunderbolt Bus: MacBook Pro, 20080d.0

I have the same problem when I updated to OS X 10.10 I lost both my USB ports as far as they will not recognize anything that I plug into them. The power part of the USB seams to work since it will recharge my Striiv Touch but nothing shows up when you connect anything to the ports.
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Hardware Information: ℹ️
MacBook Pro (Retina, 15-inch, Late 2013) (Verified)
MacBook Pro - model: MacBookPro11,3
1 2.3 GHz Intel Core i7 CPU: 4-core
16 GB RAM Not upgradeable
BANK 0/DIMM0
8 GB DDR3 1600 MHz ok
BANK 1/DIMM0
8 GB DDR3 1600 MHz ok
Bluetooth: Good - Handoff/Airdrop2 supported
Wireless: en0: 802.11 a/b/g/n/ac
System Software: ℹ️
OS X 10.10.1 (14B25) - Uptime: 1:43:41
USB Information: ℹ️
Apple Internal Memory Card Reader
Apple Inc. BRCM20702 Hub
Apple Inc. Bluetooth USB Host Controller
Apple Inc. Apple Internal Keyboard / Trackpad

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Try:
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After Yosemite update, iTunes recognizes but won't play songs

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