The power adapter that came with the MBP I bought March 2008 frayed pretty early. Now, over the night, it has stopped working; it won't charge the battery or power the machine. Upon close inspection I see that there is a tiny, brown speck on it, where it has frayed. It is too small to say whether it's worn through the plastic or if it's the heat problem some people have reported. I'm gonna buy a new one, but I wonder: do the new ones fray, too? Are they safer? I don't want it to burn my house down.