hi folks, I hastily installed Ubuntu per my sister's request. Neither of us are computer geeks, how ever she does some programming and a colleague of her's recommended it. I installed Ubuntu on her Intel iMac from a disk and ran boot camp. All seemed fine as I chose the option of installing it side-by-side. However, once in Ubuntu, I cannot boot back into OS X. I get the option to load either 32 or 64 bit OS X, however, the system hangs. I'd like to avoid my sister's wrath, so any help would be appreciated.