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several reasons : 1.check cables, if too long and poor quality you get echoes in signal and shadows in the projected picture.
2.feed the right solution to the projector and adjust in menu pc adjustment the item FINE Sync. native resolution is 1024 x 768.
There are many reasons why a computer may freeze or completely crash.
The most common reason is an overload in the memory. Computers have
a set amount of memory to work with (this is their RAM, or "Random
Access Memory"). If you attempt to do more with the computer
than it's capable of handling at one time, it may "crash"
in an attempt to save itself. Generally, the cause of this is generally
that too many programs are running at once for the computer to handle.
If you are not using a program, close it.
Conflicts between programs are other well-known reasons for crashes.
Programs such as virus detectors are notorious for conflicting with
other applications and utilities. If you notice that crashes are
occurring while the same two programs are running, try to avoid
running these two programs at the same time.
What Can I Do?
Your first step should be to pay attention to what was happening
at the time of the freeze or crash. Try to isolate the program
that may be causing problems (this can help prevent a further,
more damaging, crash). Is there a history of problems with a particular
program (or combination of programs) on your computer? Were too
many programs running at once? Was it a particular task you were
trying to do? See if you can form a hypothesis about the cause.
By understanding what may have caused it this time, you can attempt
to avoid future, similar occurrences.
Try to End the Program
Windows provides a "Task Manager" that lists all current
programs in operation. In Windows 9x & ME, this menu is brought
up by pressing Ctrl + Alt + Delete at the same time. In Windows
2000, after pressing Ctrl + Alt + Delete, click the "Task
List" button. In this menu, you can attempt to individually
close programs that are causing problems. If programs are unresponsive,
Windows will attempt to notify you of this in the Task Manager. If
you are able to effectively close the program causing problems,
save your work in all other open programs, and reboot your computer.
This will help to prevent further crashes, and give your system
a clean slate to work from again.
If you are not able to effectively close the program in question,
you have several options. Please note that any changes in unsaved
documents WILL be lost in a system reboot.
With the Task Manager open, try pressing Ctrl + Alt + Delete once
more. Windows will attempt to reboot itself.
If the Task Manager does not respond, you still have a few options.
Check your computer's tower to see if there is a "Reset"
button (it will be in the general area of the normal "Power"
button, and should be slightly smaller than it). Press the "Reset"
button, and your computer should reboot.
If you are unable to find the "Reset" button or do not
have one, there is one final option to pursue. Find the "Power"
button on your computer's tower. Press and hold this button. You
will need to hold it for a few seconds (sometimes up to ten full
seconds). At some point, your computer should shut down completely.
If nothing happens, keep holding the button. Do not press and let
go without giving the computer a fair chance to shut down.
check the options to see if the option to allow songs with digital media rights is enabled. This sometime prohibits the songs from being downloaded to the player if they were downloaded from itunes or rhapsody.