When I pressed the power button it hangs on the welcome screen and what wrong with the system

When power on the MacPro it hangs on the welcome screen. What should I do to overcome this issue

I would recomend reseting the PRAM. A small amount of your computer’s memory, called “parameter random-access memory” or PRAM, stores certain settings in a location that Mac OS X can access quickly. The particular settings that are stored depend on your type of Mac and the types of devices connected to it. The settings include your designated startup disk, display resolution, speaker volume, and other information.
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Immediately press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until the computer restarts, and you hear the startup sound for the second time.
Release the keys.
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.  Hope this helps!

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    com.apple.driver.XsanFilter    404
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    com.apple.driver.AppleFWOHCI    4.8.9
    com.apple.driver.AirPort.Brcm4331    560.7.21
    com.apple.driver.AppleSDXC    1.2.2
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    com.apple.driver.AppleEFINVRAM    1.6.1
    com.apple.driver.AppleSmartBatteryManager    161.0.0
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    com.apple.driver.AppleUSBXHCI    1.0.7
    com.apple.driver.AppleACPIButtons    1.5
    com.apple.driver.AppleRTC    1.5
    com.apple.driver.AppleHPET    1.7
    com.apple.driver.AppleSMBIOS    1.9
    com.apple.driver.AppleACPIEC    1.5
    com.apple.driver.AppleAPIC    1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient    195.0.0
    com.apple.nke.applicationfirewall    3.2.30
    com.apple.security.quarantine    1.3
    com.apple.security.TMSafetyNet    8
    com.apple.driver.AppleIntelCPUPowerManagement    195.0.0
    com.apple.driver.AppleUSBBluetoothHCIController    4.0.7f2
    com.apple.iokit.IOBluetoothFamily    4.0.7f2
    com.apple.driver.AppleFileSystemDriver    13
    com.apple.driver.AppleUSBMultitouch    230.5
    com.apple.driver.AppleThunderboltDPInAdapter    1.8.4
    com.apple.driver.AppleThunderboltDPAdapterFamily    1.8.4
    com.apple.driver.AppleThunderboltPCIDownAdapter    1.2.5
    com.apple.iokit.IOUSBHIDDriver    5.0.0
    com.apple.driver.AppleUSBMergeNub    5.0.7
    com.apple.driver.AppleUSBComposite    5.0.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice    3.2.1
    com.apple.iokit.IOBDStorageFamily    1.7
    com.apple.iokit.IODVDStorageFamily    1.7.1
    com.apple.iokit.IOCDStorageFamily    1.7.1
    com.apple.driver.AppleThunderboltNHI    1.6.0
    com.apple.iokit.IOThunderboltFamily    2.0.3
    com.apple.iokit.IOSCSIArchitectureModelFamily    3.2.1
    com.apple.iokit.IOFireWireFamily    4.4.5
    com.apple.iokit.IO80211Family    420.3
    com.apple.iokit.IOEthernetAVBController    1.0.1b1
    com.apple.iokit.IONetworkingFamily    2.1
    com.apple.iokit.IOUSBUserClient    5.0.0
    com.apple.iokit.IOAHCIFamily    2.0.8
    com.apple.iokit.IOUSBFamily    5.0.8
    com.apple.driver.AppleEFIRuntime    1.6.1
    com.apple.iokit.IOHIDFamily    1.7.1
    com.apple.iokit.IOSMBusFamily    1.1
    com.apple.security.sandbox    177.5
    com.apple.kext.AppleMatch    1.0.0d1
    com.apple.driver.DiskImages    331.7
    com.apple.iokit.IOStorageFamily    1.7.2
    com.apple.driver.AppleKeyStore    28.18
    com.apple.driver.AppleACPIPlatform    1.5
    com.apple.iokit.IOPCIFamily    2.7
    com.apple.iokit.IOACPIFamily    1.4

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