I just bought a new OEM replacement bulb for my JVC projection tv 56FH97. I installed two others and had no problems, however, after installing first thing this a.m., I now notice it has a big shadow in center left of screen. My concern is that the fan may not be working, however, I hear what appears to be the fan while powered on. Any thoughts what the problem could be? I didn't notice any shadow when first turned on for my mother who has been watching TV for about 3.5hrs.