Imac wont boot up, tried everything

Hi.
I have the June 2011 imac 21.5. I installed Lion onto it and have had no problems at all. Today i tried to to a partition with the boot camp assistant app that was already on the mac. Everything was going fine, i put the disc in with windows 7 and it rebooted. When it rebooted i had a screen saying ''no bootable device, insert boot disk and press any key'
I tried it and nothin happened. I have been on my phone for the past 2 hours looking at solutions such as resseting pram (cmd alt p r) that done nothing. I cant boot into safe mode and holding alt/option at start up does nothing. Im getting really annoyed with it now, nothing will work and i need this fixed tonkght as i have college work due in tomorrow. Any help will be appreciated.
Thanks !
Ps - sorry for bad spelling, im using my phone and dont have time to check back through it.
Oh and i can provide a photo of the screen if need be

is the disk still in your cd drive? hold eject to take it out and then try
you might want to try making this if you have a usb flashdrive with nothing on it. http://support.apple.com/kb/DL1433
however you'll need a computer to make it. this is not a good sign however,
YES!!! good to know!

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                        Macintosh HD (disk0s2) /: 499.25 GB (350.35 GB free)
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              [loaded] com.adobe.fpsaud.plist 3rd-Party support link
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              [loaded] com.anchorfree.ajaxserver.plist 3rd-Party support link
              [loaded] com.microsoft.office.licensing.helper.plist 3rd-Party support link
              [loaded] com.sophos.autoupdate.plist 3rd-Party support link
              [loaded] com.sophos.intercheck.plist 3rd-Party support link
              [loaded] com.sophos.notification.plist 3rd-Party support link
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              [not loaded] com.adobe.AAM.Updater-1.0.plist 3rd-Party support link
              [loaded] com.adobe.CS5ServiceManager.plist 3rd-Party support link
              [loaded] com.sophos.uiserver.plist 3rd-Party support link
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              Flip4Mac WMV Plugin: Version: 2.4.4.2 3rd-Party support link
              FlashPlayer-10.6: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
              OVSHelper: Version: 1.1 3rd-Party support link
              Flash Player: Version: 12.0.0.38 - SDK 10.6 3rd-Party support link
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              SharePointBrowserPlugin: Version: 14.0.0 3rd-Party support link
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              BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
              AirPlay: Version: 1.9 - SDK 10.9
              AppleAVBAudio: Version: 2.0.0 - SDK 10.9
              iSightAudio: Version: 7.7.3 - SDK 10.9
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              DivX  3rd-Party support link
              Flash Player  3rd-Party support link
              Flip4Mac WMV  3rd-Party support link
              Growl  3rd-Party support link
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              None
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              /Library/Sophos Anti-Virus
                        SophosAntiVirus:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
                        SophosAutoUpdate:          Version: 8.0.15 - SDK 10.5 3rd-Party support link
                        SophosUIServer:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
                        InterCheck:          Version: 8.0.8.1 - SDK 10.5 3rd-Party support link
              VLC:          Version: 2.0.1 - SDK 10.5 3rd-Party support link
              Sophos Anti-Virus:          Version: 8.0.21 - SDK 10.5 3rd-Party support link
              Spotify:          Version: 0.8.4.93.gd9f49c35 - SDK 10.5 3rd-Party support link
              Install Spotify:          Version: 1.0 - SDK 10.5 3rd-Party support link
                        /Users/[redacted]/Downloads/Programs/Install Spotify.app
    Time Machine:
              Time Machine not configured!
    Top Processes by CPU:
                   2%          WindowServer
                   2%          EtreCheck
                   0%          Google Chrome
                   0%          hidd
                   0%          SophosUIServer
    Top Processes by Memory:
              438 MB          firefox
              139 MB          InterCheck
              119 MB          com.apple.IconServicesAgent
              106 MB          Google Chrome
              78 MB          mds_stores
    Virtual Memory Information:
              370 MB          Free RAM
              1.59 GB          Active RAM
              1.25 GB          Inactive RAM
              813 MB          Wired RAM
              397 MB          Page-ins
              0 B          Page-outs
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