Mac partition dont work on my dual boot imac

Since some days my mac partition wont start up. The windows partition works fine. Recovery dont work. Not even in save mode. I have upgraded my mac to lion from the original snow leopard install. al worked fine until some days ago. No rinstall with the original disks or restore/repare. Starting up with the snow leopard dvd the screen shows disk utityties but selecting them takes forever. already tried diferent startup posibilities (puschin different keys) but nothing helps. I dont need to recover the old installation, i have everyting in backup, but want to reinstall at least my mac os. Anyone? I suspect a automated disk utility in windows to have damaged my mac partition. My Imac is 2 years old.
Roger

It sounds like the TV you are plugging it into, can't handle the 1280x1024 resolution. You may just have to deal with the 1024x768 res.

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