Hi, I just bought a Sony VPL SC50 on e-bay for £600. I hope this works out to be a decent buy since I haven't got the £1500 plus for a new machine. On using the projector I notice there is a load of background 'gunk' plus about 8 areas where I either get red or green spots. The spots aren't visible when the default blue screen is used but are definitely visible when the screen goes black. I read on the forum that dead pixels are quite sharp and focused but these ones are pretty fuzzy. So what are they? Can anyone help? I think I probably need to get the machine serviced! Thanks for any help!