I've lost my boot menu options.

When i boot and hold command all I can see is my windows partition. How can I re-install OSX/recover my HD. (only had for 2 weeks and It came with no boot CD or USB). As i only have windows i need to be able to do any recovery from there.
What i've think i've done is ruin the EFI Boot Loader when trying to create a second partition in my "bootcamp" partition.
So how can i do a fresh reinstall/get the option to boot from my recovery partition.

Cheers for the suggestion but Command+R Also does not work. I have reinstalled windows to what what was my boot camp partition now but I still cant see a way to back to OSX install it.

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    enduser wrote:I've successfully installed arch on my mid-2012 (5,1) 11" Macbook Air, and now I'm trying to get an entry in apple's boot menu (the one that shows when you hold 'option' when starting the computer).  From the author of rEFInd's install instructions (http://www.rodsbooks.com/refind/installing.html#osx) it sounds like I can just add some files to `/dev/sda1` (a vfat directory that contains the stuff needed to boot macos), and then run apple's `bless` command and we're good to go.
    Not quite. That makes a boot loader bootable, but it doesn't add an entry to Apple's boot manager menu. There's a blog post somewhere by Matthew Garrett that describes the steps necessary to add something to Apple's boot manager, but I couldn't find it in a quick Web search. Maybe you'll have better luck, or be able to track down the same information somewhere else. As I recall, it involves using a separate HFS+ volume, creating two or three dummy files, and using "bless" in OS X.
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