Tried to restart computer and hasn't been able to turn on since

My computer was working just fine. I shut down it down for about an hour and when I tried to turn it back on nothing happened, no noise, no lights, nothing. I left it unplugged for a while and tried the SMU restart thing but nothing helped. Does anyone have any information that might help me? Thanks in advance.

hello
you are right, it is very likely a PSU problem. i have just repaired my iMac G5 which had a similar problem. Please have a look here at this thread:
http://discussions.apple.com/message.jspa?messageID=9285919#9285919
What you can do: open the iMac (see apple website) and look at the LEDs (see the link to the Apple downloads in the thread mentioned). Have a look at the website of Jimwarolic (mentioned in the same thread). This might indicate to you whether it's the PSU or not.
Also: the link in the thread gives you an idea how you can repair this.
Hope this helps. please report back
Thomas

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              1 3.06 GHz Intel Core 2 Duo CPU: 2 cores
              4 GB RAM
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              NVIDIA GeForce 9600M GT - VRAM: 512 MB
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              AirPlay: Version: 1.9
              AppleAVBAudio: Version: 2.0.0
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                        EFI (disk0s1) <not mounted>: 209.7 MB
                        Macintosh HD (disk0s2) /: 499.25 GB (220.49 GB free)
                        Recovery HD (disk0s3) <not mounted>: 650 MB
              HL-DT-ST DVDRW  GS23N 
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              Apple Internal Memory Card Reader
              Apple Inc. Apple Internal Keyboard / Trackpad
              Apple Computer, Inc. IR Receiver
              Apple Inc. BRCM2046 Hub
                        Apple Inc. Bluetooth USB Host Controller
    FireWire Information:
    Thunderbolt Information:
    Kernel Extensions:
              com.rim.driver.BlackBerryUSBDriverInt          (0.0.64)
              com.livedrive.filesystems.livedrivefs          (2.1.14)
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              [loaded] com.adobe.versioncueCS4.plist
              [loaded] com.creativebe.MainMenuHelper.plist
              [loaded] com.macpaw.CleanMyMac2.Agent.plist
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              [loaded] com.microsoft.office.licensing.helper.plist
              [loaded] com.rim.BBDaemon.plist
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              [loaded] com.hp.productresearch.plist
              [loaded] com.rim.BBLaunchAgent.plist
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              [failed] com.macpaw.CleanMyMac2Helper.scheduledScan.plist
              [failed] com.macpaw.CleanMyMac2Helper.trashWatcher.plist
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              DC30 Xact Driver Panel
              Flash Player
              Flip4Mac WMV
              Perian
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              AdobePDFViewerNPAPI.plugin
              Default Browser.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
              Flip4Mac WMV Plugin.plugin
              iPhotoPhotocast.plugin
              JavaAppletPlugin.plugin
              OfficeLiveBrowserPlugin.plugin
              QuickTime Plugin.plugin
              SharePointBrowserPlugin.plugin
              Silverlight.plugin
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              Auto backup: NO
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                   1%          Microsoft PowerPoint
                   0%          BBLaunchAgent
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                   0%          aosnotifyd
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              123 MB             Safari
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              45 MB              com.apple.WebKit.WebContent
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    Virtual Memory Statistics:
              72 MB              Free RAM
              1.27 GB            Active RAM
              1.24 GB            Inactive RAM
              667 MB             Wired RAM
              2.58 GB            Page-ins
              111 MB             Page-outs

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    Online:        Yes
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    Select Library from the drop down menu
    Then navigate to Application Support > iLifeAssetManagement > assets
    Right click on the 'sub' folder and choose Compress
    Drag the resulting zip file to your Desktop (as a backup)
    Go to your System Preferences and choose iCloud
    Turn OFF the iCloud Photos option
    Go back to Library > Application Support and DELETE the iLifeAssetManagement folder
    Now, in System Preferences, turn the iCloud Photos option ON
    iPhoto should now be able to launch. Give it enough time to re-download your Photo Stream content. if you are missing any of your My Photo Stream photos (more than 30 days old), unzip the sub folder on your desktop and drag that into iPhoto.

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