My Mac is Not switching on,

Tried to Switch on my Mac but will Not Start
I check power, Connection all ok
Any ideas?

Hi Jminto,
Thanks for visiting Apple Support Communities.
If your computer does not turn on, try these steps next:
If the wall outlet is working and you continue to have no power try another power cord or adapter if available. If it works you may need a replacement cord or adapter.
Note: See Apple Portables: Troubleshooting MagSafe adapters for further troubleshooting with MagSafe adapters.
Disconnect all accessories that are plugged in to the computer, such as a printer, hub, or other mobile device.
If your Mac supports user-installable memory, solid state drive, or hard drive, and you recently installed any of these, make sure they are installed correctly and are compatible with your computer. If possible, reinstall the original memory or drive into the computer to find out if the behavior persists afterwards.
MacBook Pro: How to remove or install memory
MacBook: How to remove or install memory
Mac Pro: How to remove or install memory
Mac mini: How to remove or install memory
iMac (27-inch, Late 2012): Installing or replacing memory
iMac: How to remove or install memory
Reset the SMC.
If you are still unable to start up your computer after trying each of these steps, visit an Apple Store orApple Authorized Service Provider (AASP) for further diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
You can find the article with these steps here:
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367
Regards,
Jeremy

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Mac does not switch off. Any idea how to fix this?

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Yes, this was exactly the sequence and again it worked...
Here is the result of the ps ax command:
Last login: Fri May 25 09:22:33 on console
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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fsolution wrote:
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This is often the problem with the new features that Apple implement more and more for each functionalities and moving them to "the cloud" (iCloud).
Thus physically removing the files from the Mac makes the BBDM (logically) unable to sync with no-more existing files on the computer...
This is the case currently for the address book and iCal. I guess that new functionalities in iTunes might have the same effect. Haven't you enabled new features recently in iTunes?
Like "iTunes match" for example?...
Please don't forget to mark as "solved" if your question is replied and to "like" a useful reply to your post ;-)

My Mac is Not switching on,

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