When Steve Jobs released the MacBook Air at the recent MacWorld Expo, the thin notebook met with varied interest levels. As the weeks have passed, an increased number of problems have been reported. There are concerns that the heat builds up in the notebook and that the computer might automatically shut down one of its CPUs to compensate, causing the system to slow down. There are also issues with lack of compatibility for early 802.11n routers, poor video quality and the necessity of an adapter for the headphone jack. Finally 3G users will find that they can't fit their modems into the tiny USB port designed for the new laptop.