I can't get the computer videos to play through the projector. Everything is connected.

disconnect the cable at the projector end and plug into a monitor to check that the video signal is enabled on the cable. If it is then reconnect to the projector and select a lower resolution on the pc screen setting. See if anything appears on the projector

Hmmmm... You sure should have an option in your Control Panel for that settings. Try exploring your "Screen Resolution" by right clinking on the Desktop, and clicking "Screen Resolution". There'll be options for "Detect" and "Identify". When you connect your Projector, try the "Detect" option and see if a new Display is detected. If there is, click on it and look for "Advanced Settings" and try to find the option for "Invert" or "Mirror" display or something like that.
Or the easier option is to mount your Optima upside down but of course you won't do that as it may be very absurd and funny. (Kidding...

unfortunatly this can not be functioned,
the product unfortunatly does'nt surport this.

computer should always be connected with 15 pin VGA to DVI-I cable.
Select in menu input 1 analog RGB and adjust output resolution of Dell to 1024 x 768. this should work !
USB is only for mouse control with pj remote

Hey. Sounds like you are using some kind of dual-view or extended desktop via the computer for video. This may sometimes be a problem. If you can see the desktop but no video using the projector it is not a projector problem. It is probably your grapic card och software problem.

Try different setups in the graphic cards settings, like the projector as primary monitor etc. That usually solves the problem.

/Patrik

you can try changing your overlay settings. works with some formats. or you could use the projector as main display (toggle through fn+LCD/CRT)

1.
Connect the external display port on your laptop computer to the projection system, and then turn on the projector. For information about connecting external devices to your laptop, see the documentation for your laptop computer.
1.
Set the display resolution of your laptop computer to match the resolution of the projector system. First, on your laptop, open the Display Properties dialog box by using the Display icon in Control Panel, and click the Settings tab. Then, in Screen resolution area, move the slider to adjust the display resolution of your laptop. If you don't know which setting to choose, try 800 x 600 pixels; this is a common setting for many projector systems. YOURS sounds like 640x840.
3.
If you have audio in your presentation, connect a cable from your laptop's audio output jack to the audio input jack on the projector, and then test the volume by playing a file that contains sound.
4.
Start the Player on your laptop. If you want to only display the Player on the big screen, and not the desktop background, maximize the Player or set it to play your video using the entire screen (full-screen mode).

Wireless signal level may be low, have you tried moving the sending source closer to the receiver?
If that fixes it make sure the transmitter has a clear shot to the receiver.
If thats not it try connecting directly to rule out anything else but the wireless.
Make sure the wireless is not over heating.
Also are you playing the DVD with the computer? does it play fine on the computer alone?
If none of that helps please elaborate on your setup. and is the video simply synched wrong or is the video jumping and jittery as well as out of sync?

I'm guessing your trying to play the DVD on a PC or laptop, in which case if you change the display settings so the video is only output through the projector and not on the PC/laptop screen the video will then play back properly.

Select the menu and go to the input selection. set it to Computer. or manually press INPUT.