IMac freezing during startup

So I was working on my iMac the other day and all of a sudden the screen went blank (grey screen). Turned it off using the power button and restarted it. I get the chime and the apple logo coming up with the scrolling wheel below but then the screen goes blank and I can't get any further than that.
Have tried booting up in safe mode (Shift), verbose (Cmd+V), starting in Recovery System (Cmd+R), Single User Mode (Cmd+S) and resetting the NVRAM/PRAM (Option + Cmd + P + R). Nothing has worked. Always get to the apple logo and scrolling wheel only to freeze on a gray screen after that.
Can't find my Install Disc but have tracked one down that I'm going to try tomorrow.
Besides the Install Disc does anyone have any suggestions that could help me out? Only have a portion of my HD backed up (stupid I know) so really hoping this issue is solveable and that I can salvage what I have on that computer.
Thanks!!

Try booting while holding down the Option key.
Theoretically that should launch the Startup Manager window where you can select the startup disk then click Restart.
The original install disc cannot repair the startup disk on a Mac running v10.7 Lion. Only OS X Recovery

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    10/21/12 6:23:28.000 PM kernel[0]: [200|501] UserEventAgent   async. scan: #'/private/var/db/launchd.db/com.apple.launchd.peruser.501/overrides.plist' act=0x00000002 rsn='ETYP1' ln='1591'
    10/21/12 6:23:35.000 PM kernel[0]: [2888|501] Console          async. scan: #'/Applications/Utilities/Console.app/Contents/Resources/English.lproj/Console. nib' act=0x00000002 rsn='ETYP1' ln='1591'
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    10/21/12 6:23:36.000 PM kernel[0]: [248|501] Finder           async. scan: #'/System/Library/CoreServices/Finder.app/Contents/Resources/English.lproj/Grou pNameField.nib' act=0x00000002 rsn='ETYP1' ln='1591'
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    10/21/12 6:23:38.000 PM kernel[0]: decmpfs.c:1339:decmpfs_read_compressed: decmpfs_fetch_uncompressed_data err -35
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    10/21/12 6:23:39.439 PM Finder[248]: ISGetIconFamilyFromStorage: seed mismatch for 26b90043, actual seed is 7c6e151c
              1   OSServices                          0x00007fff84e58950 _ZL26ISGetIconFamilyFromStoragejPP17CIconStorageArrayPj + 140
              2   OSServices                          0x00007fff84e8708b _ISIsStorageOnTheVolume + 23
              3   OSServices                          0x00007fff84eb15ce _ISIsAnyOfImageStoragesOnTheVolume + 47
              4   LaunchServices                      0x00007fff8ec38313 _ZN13CIconRefEntry23DataChangedAfterUnmountEs + 13
              5   LaunchServices                      0x00007fff8ec374a8 _ZN13CIconRefArray13UnmountVolumeEs + 82
              6   LaunchServices                      0x00007fff8ec382fc _ZL21MountNotificationHookP15VolumeNoticeBlk + 39
              7   CarbonCore                          0x00007fff8a2ed8db _Z29_FSVolumeNotificationCallbacksPK10__CFStringPKvPv + 282
              8   CarbonCore                          0x00007fff8a2b9e4e _FSVolumeObserverCallback + 165
              9   CoreFoundation                      0x00007fff88007410 __CFMachPortPerform + 288
              10  CoreFoundation                      0x00007fff880072d9 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
              11  CoreFoundation                      0x00007fff88007019 __CFRunLoopDoSource1 + 153
              12  CoreFoundation                      0x00007fff8803a19f __CFRunLoopRun + 1775
              13  CoreFoundation                      0x00007fff880396b2 CFRunLoopRunSpecific + 290
              14  HIToolbox                           0x00007fff8419c0a4 RunCurrentEventLoopInMode + 209
              15  HIToolbox                           0x00007fff8419bd84 ReceiveNextEventCommon + 166
              16  HIToolbox                           0x00007fff8419bcd3 BlockUntilNextEventMatchingListInMode + 62
              17  AppKit                              0x00007fff8fb42613 _DPSNextEvent + 685
              18  AppKit                              0x00007fff8fb41ed2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
              19  AppKit                              0x00007fff8fb39283 -[NSApplication run] + 517
              20  AppKit                              0x00007fff8faddcb6 NSApplicationMain + 869
              21  Finder                              0x0000000100f91b46 Finder + 23366
              22  libdyld.dylib                       0x00007fff879347e1 start + 0
    10/21/12 6:23:39.564 PM com.apple.backupd[2808]: Ejected Time Machine disk image: /Volumes/Data-1/Willem’s iMac.sparsebundle
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              1   OSServices                          0x00007fff84e58950 _ZL26ISGetIconFamilyFromStoragejPP17CIconStorageArrayPj + 140
              2   OSServices                          0x00007fff84e8708b _ISIsStorageOnTheVolume + 23
              3   OSServices                          0x00007fff84eb15ce _ISIsAnyOfImageStoragesOnTheVolume + 47
              4   LaunchServices                      0x00007fff8ec38313 _ZN13CIconRefEntry23DataChangedAfterUnmountEs + 13
              5   LaunchServices                      0x00007fff8ec374a8 _ZN13CIconRefArray13UnmountVolumeEs + 82
              6   LaunchServices                      0x00007fff8ec382fc _ZL21MountNotificationHookP15VolumeNoticeBlk + 39
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              9   CoreFoundation                      0x00007fff88007410 __CFMachPortPerform + 288
              10  CoreFoundation                      0x00007fff880072d9 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
              11  CoreFoundation                      0x00007fff88007019 __CFRunLoopDoSource1 + 153
              12  CoreFoundation                      0x00007fff8803a19f __CFRunLoopRun + 1775
              13  CoreFoundation                      0x00007fff880396b2 CFRunLoopRunSpecific + 290
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