MacBook will not run osx, with apple logo an empty load bar?

I have a Macbook white 13.3 has Osx Snow Leopard 10.6 (i have lion on usb just like Snow leopard on this mac)I also have Windos xp on the mac.I was going back in forth using both osx and then the loading multi colored circle from apple started on the Windows page.I let it go for a few minutes.Everything stayed frozen.I held the power button and turned off.Now I get Apple icon empty load bar.Looks like its loading then just stays with apple logo.I have a few replacement hds.I like this one with the windows xp.If i reinstall snow leopard will windows parallel be there still?I am unsure and never had this issue.If I put an appe disk can I trick the mac to load???

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