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If your InFocus 4805 projector is having a hard time powering on or doesn't power on at all, it could be one of two things. Due to the extreme temperature of the lamp that causes the temperature of the projector to rise, every InFocus 4805 projector has a cooling system. Check your projector's cooling solution, as it may need to be replaced. Also check the projector's fan---if the fan doesn't spin, the unit will not turn on. If the problem is the fan, you'll have to get it replaced. You can do this at the same place you bought your projector.
If your InFocus 4805 Projector powers on but does not project any light, the lamp will need to be replaced. All projector lamps must be replaced at some point---how often usually depends on how much use the device gets. Simply order a replacement lamp, unscrew the old one and screw the new one in. The projector will then work like new.
If your InFocus 4805 projector powers on and is displaying images but the colors on the images appear warped or are not in the proper places, your "color wheel" will need to be replaced. The color wheel is a small device that essentially acts like a prism. Light is projected through it and it displays the appropriate colors on screen the way they appear in the original video source. Order a replacement color wheel that fits your model and use your instruction manual as a guide as you swap the old one out and put the new one in.
I would suggest replacing the type of cable you are using. Changing the type of connection, such as S-Video or VGA or something other than what you are using, may resolve this issue as well. Because the splash screen comes up normal, this tells us that the issues lies not with the device but with whatever it is you are connecting it to. Comment back if this does not resolve the issue and we can move further.
I have found that vertical lines that suddenly appear from projectors are due to poorly connected cables. Sut off your projector and wait for the fan to go off. Then unplug the connectors from the computer to the projector and secure them again, making sure to go all the way. Hope this helps.
Reset the projector to factory defaults,Change sources. Try plugging the projector into another computer.If the color problem persists, check the cables for bent or broken pins. If any pins are damaged, the cable will need to be replaced with an InFocus-approved cable.
Upgrade the projector firmware. If the projector still will not display the image, it is possible that there is an internal problem that requires repair.