Sometimes my Mac doesn't switch off

There is only the blue screen lights and the indicator spins, but it doesn't turn off. What to do?

try to work with bluetooth off fr some time if the prob persists try formatting if mac is old n hd is full mac it ,if again no luck there maybe a problem with the hardware take it to app repair shop

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    Here is the result of the ps ax command:
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    mbp081:~ web$ ps ax
      PID   TT  STAT      TIME COMMAND
        1   ??  Ss     0:01.98 /sbin/launchd
        9   ??  Ss     0:07.96 /usr/libexec/kextd
       10   ??  Ss     0:03.20 /usr/sbin/DirectoryService
       11   ??  Ss     0:00.11 /usr/sbin/notifyd
       12   ??  Ss     0:00.11 /usr/sbin/syslogd
       13   ??  Ss     0:02.17 /usr/libexec/configd
       14   ??  Ss     0:00.08 /usr/sbin/distnoted
       15   ??  Ss     0:00.84 /usr/sbin/blued
       16   ??  Ss     0:00.10 /usr/sbin/diskarbitrationd
       19   ??  Ss     0:00.41 /usr/sbin/mDNSResponder -launchd
       22   ??  Ss     0:01.90 /System/Library/CoreServices/coreservicesd
       25   ??  Ss     0:00.20 /usr/sbin/securityd -i
       32   ??  Ss     0:00.07 /usr/sbin/ntpd -c /private/etc/ntp-restrict.conf -n -g -p /var/run/ntpd.pid -f /var/db/ntp.drift
       33   ??  Ss     0:00.12 /usr/sbin/cupsd -l
       34   ??  Ss     0:00.37 /usr/sbin/krb5kdc -n
       35   ??  Ss     0:00.01 /usr/sbin/cron
       38   ??  Ss     0:00.08 /System/Library/PrivateFrameworks/MobileDevice.framework/Versions/A/Resources/u sbmuxd -launchd
       39   ??  Ss     0:00.02 /sbin/SystemStarter
       43   ??  Ss     0:00.06 /System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Su pport/RFBRegisterMDNS
       45   ??  Ss     0:00.38 /System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework /Support/mds
       46   ??  Ss     0:00.61 /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow console
       47   ??  Ss     0:00.01 /usr/sbin/KernelEventAgent
       49   ??  Ss     0:00.64 /usr/libexec/hidd
       50   ??  Ss     0:00.06 /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonC ore.framework/Versions/A/Support/fseventsd
       52   ??  Ss     0:00.01 /sbin/dynamic_pager -F /private/var/vm/swapfile
       58   ??  Ss     0:00.01 autofsd
       66   ??  Ss     0:02.25 /usr/libexec/ApplicationFirewall/socketfilterfw
       81   ??  Ss     0:00.03 /usr/sbin/ocspd
       88   ??  S      0:00.21 /Applications/Retrospect Client.app/Contents/Resources/retroclient
       89   ??  Ss     0:00.01 /Library/StartupItems/ParallelsTransporter/llipd
       93   ??  Ss     0:04.04 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphic s.framework/Resources/WindowServer -daemon
       94   ??  Ss     0:00.11 /usr/sbin/nmbd -F
      114   ??  Ss     0:00.05 /usr/sbin/coreaudiod
      136   ??  Ss     0:02.00 /sbin/launchd
      140   ??  S      0:02.16 /System/Library/CoreServices/Dock.app/Contents/MacOS/Dock
      141   ??  S      0:01.01 /System/Library/CoreServices/SystemUIServer.app/Contents/MacOS/SystemUIServer
      142   ??  S      0:03.13 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder
      146   ??  S      0:00.01 /usr/sbin/pboard
      147   ??  S      0:00.44 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/fontd
      150   ??  S      0:00.62 /usr/libexec/UserEventAgent -l Aqua
      153   ??  S      0:00.07 /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/MacOS/ARDAg ent
      158   ??  S      0:00.13 /System/Library/CoreServices/AirPort Base Station Agent.app/Contents/MacOS/AirPort Base Station Agent -launchd -allowquit
      159   ??  S      0:00.03 /System/Library/CoreServices/CCacheServer.app/Contents/MacOS/CCacheServer
      160   ??  S      0:00.07 /System/Library/CoreServices/RemoteManagement/AppleVNCServer.bundle/Contents/Ma cOS/AppleVNCServer
      171   ??  S      0:00.24 /System/Library/Frameworks/SyncServices.framework/Versions/Current/Resources/Sy ncServer.app/Contents/MacOS/SyncServer
      178   ??  Ss     0:00.14 /usr/sbin/smbd -F
      183   ??  S      0:05.65 /Applications/iTunes.app/Contents/MacOS/iTunes -psn_0_65552
      186   ??  S      0:00.07 /Applications/iTunes.app/Contents/MacOS/iTunesHelper.app/Contents/MacOS/iTunesH elper -psn_0_69649
      188   ??  Ss     0:01.01 /System/Library/PrivateFrameworks/ApplePushService.framework/applepushserviced
      192   ??  S      0:01.09 /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal -psn_0_73746
      195 s000  Ss     0:00.07 login -pf web
      196 s000  S      0:00.02 -bash
      204 s000  R+     0:00.01 ps ax
    mbp081:~ web$

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