My phone keeps blacking out iphone 4s

Been having problem with iphone 4 s blacking out. I was late to work several days cause my alarm clock did not go off. once it goes black it is really hard getting it back on. luckily it has always come back on so far. any advice would be appreciated.

Hey saifulislamperish,
Thanks for the question. I understand that you are experiencing power issues with your iPhone 4s. To completely isolate the issue, you may want to follow these steps:
Will not turn on, will not turn on unless connected to power, or unexpected power off
1. Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
2. Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion.
Learn about LCIs and corrosion.
3. Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
4. After at least 15 minutes, if:
               - The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen. Then unplug the phone from power. If it immediately turns off, seek service.
               - The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
               - Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
5. If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
               - If the display turns on, go to step 4.
               - If the display remains black, go to next step.
6. Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
7. If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
My issue is still not resolved. What do I do next?
Contact Apple Support.
For additional information, see this article:
iPhone: Hardware troubleshooting
http://support.apple.com/kb/TS2802
Thanks,
Matt M.

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                dependency: com.apple.iokit.IONDRVSupport(2.2)@0x961000
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    com.apple.driver.AppleHWSensor          1.9.3d0 - last loaded 26681814424
    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AGPM          100.12.31
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
    com.apple.driver.AppleHDA          2.0.5f14
    com.apple.driver.AppleMikeyDriver          2.0.5f14
    com.apple.driver.AudioAUUC          1.57
    com.apple.driver.AppleUpstreamUserClient          3.5.7
    com.apple.driver.AppleMCCSControl          1.0.20
    com.apple.driver.SMCMotionSensor          3.0.1d2
    com.apple.filesystems.ntfs          3.4
    com.apple.driver.AppleUSBOpticalMouse          3.7.5
    com.apple.driver.AppleIntelHDGraphics          6.3.6
    com.apple.driver.AppleIntelHDGraphicsFB          6.3.6
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.0a1
    com.apple.GeForce          6.3.6
    com.apple.driver.AppleLPC          1.5.1
    com.apple.driver.AppleGraphicsControl          2.10.6
    com.apple.kext.AppleSMCLMU          1.5.2d10
    com.apple.driver.AppleUSBTCButtons          201.6
    com.apple.driver.AppleUSBTCKeyboard          201.6
    com.apple.driver.AppleUSBCardReader          2.6.1
    com.apple.driver.AppleIRController          303.8
    com.apple.BootCache          31.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
    com.apple.iokit.SCSITaskUserClient          2.6.8
    com.apple.iokit.IOAHCIBlockStorage          1.6.4
    com.apple.driver.AppleUSBHub          4.2.4
    com.apple.driver.AppleFWOHCI          4.7.3
    com.apple.driver.AirPortBrcm43224          428.42.4
    com.apple.driver.AppleEFINVRAM          1.4.0
    com.apple.driver.AppleAHCIPort          2.1.7
    com.apple.iokit.AppleBCM5701Ethernet          3.0.5b8
    com.apple.driver.AppleUSBEHCI          4.2.4
    com.apple.driver.AppleACPIButtons          1.3.6
    com.apple.driver.AppleSmartBatteryManager          160.0.0
    com.apple.driver.AppleRTC          1.3.1
    com.apple.driver.AppleHPET          1.5
    com.apple.driver.AppleSMBIOS          1.7
    com.apple.driver.AppleACPIEC          1.3.6
    com.apple.driver.AppleAPIC          1.4
    com.apple.driver.AppleIntelCPUPowerManagementClient          142.6.0
    com.apple.security.sandbox          1
    com.apple.security.quarantine          0
    com.apple.nke.applicationfirewall          2.1.12
    com.apple.driver.AppleIntelCPUPowerManagement          142.6.0
    com.apple.driver.DspFuncLib          2.0.5f14
    com.apple.driver.AppleProfileReadCounterAction          17
    com.apple.driver.AppleProfileTimestampAction          10
    com.apple.driver.AppleProfileThreadInfoAction          14
    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
    com.apple.driver.AppleSMBusController          1.0.10d0
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.driver.AppleUSBAudio          2.7.6f6
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOHDAFamily          2.0.5f14
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleBacklightExpert          1.0.1
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.nvidia.nv50hal          6.3.6
    com.apple.NVDAResman          6.3.6
    com.apple.iokit.IONDRVSupport          2.2
    com.apple.iokit.IOGraphicsFamily          2.2
    com.apple.driver.AppleUSBHIDKeyboard          141.5
    com.apple.driver.AppleHIDKeyboard          141.5
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.driver.AppleUSBMultitouch          207.7
    com.apple.iokit.IOSCSIBlockCommandsDevice          2.6.8
    com.apple.iokit.IOUSBMassStorageClass          2.6.7
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.security.TMSafetyNet          6
    com.apple.driver.DiskImages          289
    com.apple.iokit.IOStorageFamily          1.6.3
    com.apple.driver.AppleACPIPlatform          1.3.6
    com.apple.iokit.IOPCIFamily          2.6.5
    com.apple.iokit.IOACPIFamily          1.3.0
    Model: MacBookPro6,2, BootROM MBP61.0057.B0C, 2 processors, Intel Core i7, 2.66 GHz, 4 GB, SMC 1.58f15
    Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
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    Bluetooth: Version 2.4.5f3, 2 service, 12 devices, 1 incoming serial ports
    Network Service: AirPort, AirPort, en1
    Serial ATA Device: Hitachi HTS545050B9SA02, 465.76 GB
    Serial ATA Device: MATSHITADVD-R   UJ-898
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
    USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0xfa130000 / 5
    USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4
    USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0xfa113000 / 7
    USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0xfa120000 / 3
    USB Device: Hub, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
    USB Device: Hub, 0x050d  (Belkin Corporation), 0x0307, 0xfd130000 / 5
    USB Device: Keyboard Hub, 0x05ac  (Apple Inc.), 0x1006, 0xfd131000 / 8
    USB Device: Apple Optical USB Mouse, 0x05ac  (Apple Inc.), 0x0307, 0xfd131300 / 10
    USB Device: Apple Keyboard, 0x05ac  (Apple Inc.), 0x0220, 0xfd131200 / 9
    USB Device: Akai MPD32, 0x09e8  (AKAI  professional M.I. Corp.), 0x006c, 0xfd135000 / 7
    USB Device: ReMOTE SL Compact, 0x1235, 0x0008, 0xfd136000 / 6
    USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0xfd110000 / 4
    USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0xfd120000 / 3

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