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DLP4500: buffer freeze of LC4500

Part Number: DLP4500
Other Parts Discussed in Thread: DLPC350

Hi

I bought a LC4500-RGB-EKT module from Keynote.
Last week, the module can project the picture of my PC screen in video mode, 
or in pattern mode with video input from HDMI port, and applied INI. file from Keynote.
but in this week, it doesn't work suddenly.
To check whether my LC4500-RGB-EKT module damaged or misconfigured.
I have checked the LED on the board, and they are all illuminated normally
In order to find out what's wrong with my module, I took my classmate's module and comparing two GUI of these two GUI.
I found system status indicators light "buffer freeze" on the GUI window of my module is highlighted yellow.
From DLPC350 Programmer's Guide, I knew it means disability of buffer swapping.
after uploading the firmware, it still doesn't work.
How can I deal with this?
Thank you
Yong-Siang Hsu