Unable to boot OSX after failed Boot Camp XP installtion

I hope someone can help me please!
I used boot camp to partion 32GB and then inserted the XP cd as requested, my iMac restarted and XP began to install, it found 'unknown volume' c: and requested a NFTS format. This was all fine, however the installtion failed and enetered a constant failed/reinstall/fix cycle, after a few hours I rebooted the machine. I am not worried about the failed XP installation;
My problem is that on boot up now it does not boot into OSX, even when rebooting whilst holding the OPT key, it finds no bootable drives and just sits a the grey screen unless I put in the XP disk, which it will to install from.
Where has my OSX partiton gone?? Help please!

I've had nothing but problems with installations since 2 years ago when I got this iMac. When I had the problem before I got a new XP disc and no problems. This time I'ts not getting me into windows. There are different options when you choose to install windows: NTFS,FAT or leave partition with current files intact or something to that extent. I dont know what I should do. I tried "leave intact" and it formatted,installed windows, then went to black screen with error message saying "error reading disc". then i forced shut down the computer since it wouldnt read either keybord and the next time i choose to delete that partition(32gb) and install a fresh copy of windows on it with the "NTFS" option. same thing as before: formatted, installed, then black screen with error message saying "cant go into windows because of corrupt file "system file". This is a brand new copy of windows mind you so im a little peeved. I basically forced shut down again, and held down option and thank god it let me choose which partition to load into. im now on my mac partition. i set the startup to default to mac.

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