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It could be 3 things--
1. You need a new cable
2. This is unlikely, but the red segment could be off the colorwheel, but if this was the case the wheel would be way out of balance and the projector would be vibrating like crazy.
3. The "color ramps" or colorwheel index in the hidden factory menu may need to be adjusted.
if it only has a blue tint when the computer or video is hooked up, reset the settings to factory default and replace the cables. if the splash screen (when it says "infocus") has the blue tint, one of the light filters are fried due to excessive heat and dust. unfortunately, you'll have to replace the entire optical engine.
first try another computer cable. if same results, press the "auto image" button on the projector. if that doesn't work, press menu, select settings, then factory reset, and "yes". if you still have the same problem, the eca (main board) is bad.