My Portable is DEAD. It worked when I first got it, but slowly, slowly started getting worse and worse. Like an old model T it used to take a few starts before it would run properly. I pulled it out 2 days ago and it just refused to run. Upon trying to start it, it just went "pfft" very softly. Last night I tried again and I got the start up chime and it tried to start itself, but then it stopped, then started again, over and over again until I shut it off. Does anyone know what might be wrong?