received my new imac 21.5 and was wondering if there is a problem with this unit. 1. the top back feels extremely hot, you cant keep your fingers there for more than a 5 seconds. 2. when touching the top back i feel a slight vibration and there is always a faint buzzing sound present. my previous imacs were dead quite. the istat nr. with moderate use are: Ambient 28 CPU 60 GPU Diode 67 GPU Heatsink 66 Mem Controller 61 Optical Drive 50 Power Supply 74 Hard Drive 54 Fans: CPU Fans 1806 HD 1549 Optical 1172 please let me know if all this is normal or there might be an issue with this unit. thank you in advance.