Imac os wont start but windows bootcamp still working fine

Hi everyone,
My imac is around 4 years old and has been running both windows bootcamp and os x snow leopard for at least 3 years without any problems. My default operating system is mac and when I tried to turn it on this morning it gets stuck on the white screen with the grey apple icon and the loading icon spinning. Also a bar appears below this that I have never seen before.
I have tried opening the mac in recovery mode but it does not respond and goes to the same logo screen.
I have tried holding the 'D' key down while the mac comes on and doing the apple hardware test but once the window pops up it does not complete the probing and appears to freeze just before its completion.
I have also tried booting in safemode but the script stops at these commands:
launch tl: Please convert the following to launchd: etc/mach_init.d/dashboardadvisory.plist
launch_msg(): socket is not connected
However, the windows bootcamp is working fine and I can access my mac files from there.
Also worth mentioning is that it is not a grey screen that appears on start up it is just the normal apple icon screen.
Tried both smc and pram resets but nothing changed.
Also when I the mac holding alt both the mac hd and windows disc are visible but obviously same problem happens when I click on mac from there.
Any advice or suggestions would be really appreciated! Thanks.

If you use the first Grey Disk and the 'C' key, can you boot into OSX and then your disks can be inspected.

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