New MacBook Pro 13' -- Random short buzzing sound

Hi all,
recently bought a MacBook Pro (Retina, 13-inch) laptop and have some issues which may or may not be related.
1. The last couple of weeks the laptop started making a random, brief, buzzing sound (maybe 1/4 of a sec in duration). Cannot identify any app that may do that. I looked in the logs (console) and there is nothing I can find to explain it - I also did a disk repair just in case
Anyone knows what the buzzing sound could be?
2. A few of times now (~3) the display wouldn't power up from sleep. I used the Alt+Cmd+P+R+power trick to reset and was fine after that. I assume that's an OS bug that will be fixed at some point. I sometimes plug the laptop to an external Dell monitor if that matters
Thanks!

Same here (Early 2015 / 256GB SSD /  i5 2,9GHz) .
Being in a very quiet room there is definitely some noise coming from the "W" / "E" keyboard area,
when accessing (especially writing on) the SSD but it's also noticeable when scrolling through webpages.
After some googling (there a lot of people with the same "problem") I think that it isn't some sort of defect.
MacBook Pro Retinas apparently tend to produce this very faint so called "coil (whine) noise" coming from inductors inside of it
trying to regulate high voltages. I think that's the tradeoff having such ultra fast SSDs.
(I'm getting around 1200 Write and 1300 Read which is just insane!)
It doesn't bother me that much though, I was just wondering because I couldn't figure out what part the noise is coming from
since there are no moving parts in the MacBook Pros with Retina Display (except for the fan of course).
I won't return my MacBook just to get another one with the same issue (which happened to some of the people)
and apart from this mysterious, faint noise it's perfect.

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    Kernel UUID: 9477416E-7BCA-3679-AF97-E1EAAD3DD5A0
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    System uptime in nanoseconds: 24491520512542
    last loaded kext at 1143081757707: com.apple.filesystems.smbfs    2.0.3 (addr 0xffffff7f836f7000, size 335872)
    last unloaded kext at 305015135948: com.apple.filesystems.msdosfs    1.9 (addr 0xffffff7f836f7000, size 57344)
    loaded kexts:
    com.apple.filesystems.smbfs    2.0.3
    com.apple.driver.AudioAUUC    1.60
    com.apple.filesystems.autofs    3.0
    com.apple.driver.AppleUpstreamUserClient    3.5.13
    com.apple.driver.AppleGraphicsDevicePolicy    3.6.22
    com.apple.driver.AppleHDA    2.6.3f4
    com.apple.iokit.IOBluetoothSerialManager    4.2.7f3
    com.apple.driver.AGPM    100.14.34
    com.apple.driver.ApplePlatformEnabler    2.0.9d7
    com.apple.driver.X86PlatformShim    1.0.0
    com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport    4.2.7f3
    com.apple.driver.AppleThunderboltIP    1.1.2
    com.apple.iokit.IOUserEthernet    1.0.0d1
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    com.apple.driver.AppleLPC    1.7.0
    com.apple.driver.AppleSMCLMU    2.0.4d1
    com.apple.Dont_Steal_Mac_OS_X    7.0.0
    com.apple.driver.AppleHWAccess    1
    com.apple.driver.AppleBacklight    170.4.11
    com.apple.driver.AppleMCCSControl    1.2.5
    com.apple.driver.AppleIntelHD5000Graphics    8.2.8
    com.apple.driver.AppleIntelFramebufferAzul    8.2.8
    com.apple.driver.AppleUSBTCButtons    240.2
    com.apple.driver.AppleUSBTCKeyboard    240.2
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    com.apple.AppleFSCompression.AppleFSCompressionTypeLZVN    1.0.0d1
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    com.apple.driver.AppleUSBHub    683.4.0
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    com.apple.driver.AppleAHCIPort    3.0.5
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    com.apple.driver.AppleUSBXHCI    683.4.0
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    com.apple.driver.AppleRTC    2.0
    com.apple.driver.AppleHPET    1.8
    com.apple.driver.AppleSMBIOS    2.1
    com.apple.driver.AppleACPIEC    2.0
    com.apple.driver.AppleAPIC    1.7
    com.apple.nke.applicationfirewall    153
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    com.apple.kext.triggers    1.0
    com.apple.driver.DspFuncLib    2.6.3f4
    com.apple.vecLib.kext    1.0.0
    com.apple.iokit.IOAudioFamily    1.9.7fc2
    com.apple.kext.OSvKernDSPLib    1.14
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    com.apple.iokit.IOBluetoothHostControllerUSBTransport    4.2.7f3
    com.apple.driver.AppleHDAController    2.6.3f4
    com.apple.iokit.IOHDAFamily    2.6.3f4
    com.apple.driver.X86PlatformPlugin    1.0.0
    com.apple.driver.IOPlatformPluginFamily    5.7.1d6
    com.apple.iokit.IOBluetoothFamily    4.2.7f3
    com.apple.driver.AppleSMC    3.1.8
    com.apple.driver.AppleSMBusController    1.0.12d1
    com.apple.driver.AppleBacklightExpert    1.0.4
    com.apple.driver.AppleGraphicsControl    3.6.22
    com.apple.iokit.IOSurface    91.1
    com.apple.iokit.IONDRVSupport    2.4.1
    com.apple.AppleGraphicsDeviceControl    3.6.22
    com.apple.iokit.IOAcceleratorFamily2    98.23
    com.apple.iokit.IOGraphicsFamily    2.4.1
    com.apple.driver.AppleUSBMultitouch    240.10
    com.apple.driver.AppleThunderboltDPInAdapter    3.1.7
    com.apple.driver.AppleThunderboltDPAdapterFamily    3.1.7
    com.apple.driver.AppleThunderboltPCIDownAdapter    1.4.5
    com.apple.iokit.IOSCSIBlockCommandsDevice    3.6.7
    com.apple.iokit.IOUSBMassStorageClass    3.6.0
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.6.7
    com.apple.driver.AppleUSBMergeNub    650.4.0
    com.apple.iokit.IOUSBHIDDriver    660.4.0
    com.apple.driver.AppleUSBComposite    656.4.1
    com.apple.iokit.IOUSBUserClient    660.4.2
    com.apple.iokit.IOAHCIFamily    2.6.5
    com.apple.driver.AppleThunderboltNHI    2.0.1
    com.apple.iokit.IOThunderboltFamily    3.3.1
    com.apple.iokit.IO80211Family    640.36
    com.apple.driver.mDNSOffloadUserClient    1.0.1b5
    com.apple.iokit.IONetworkingFamily    3.2
    com.apple.iokit.IOUSBFamily    686.4.1
    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    278.11.1
    com.apple.kext.AppleMatch    1.0.0d1
    com.apple.security.TMSafetyNet    7
    com.apple.driver.AppleKeyStore    2
    com.apple.driver.DiskImages    371.1
    com.apple.iokit.IOStorageFamily    1.9
    com.apple.iokit.IOReportFamily    23
    com.apple.driver.AppleFDEKeyStore    28.30
    com.apple.driver.AppleACPIPlatform    2.0
    com.apple.iokit.IOPCIFamily    2.9
    com.apple.iokit.IOACPIFamily    1.4
    com.apple.kec.pthread    1
    com.apple.kec.corecrypto    1.0
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    Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
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    Bluetooth: Version 4.2.7f3 14616, 3 services, 15 devices, 1 incoming serial ports
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    USB Device: Internal Memory Card Reader
    USB Device: BRCM20702 Hub
    USB Device: Bluetooth USB Host Controller
    USB Device: Apple Internal Keyboard / Trackpad
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