My new iMac has been shutting down randomly since friday. It seems to shut down right after I turn it on. Sometimes the apple logo appears when booting up and then dies instantly. It's the new 21.5 3.06 GHz iMac. (Bought it a little over a month ago) I called my local apple store and they told me to bring it in. I'm wondering if anyone else had this problem or if there is a quick fix for this. I really don't want to bring in my iMac to the store.