LCD ripple display problem

I have a new purchase iMac, after a while of use, I discover that there is some ripple display on the top right corner. Send back to apple, they said there is external water go inside.
But truly, this is not real, it might inherent with this problem in the very beginning, it is that if you don't pay attention, you will not see it.
Have anyone encounter this problem ? I am very suffer and disappoint with the customer service and repair center feedback.
Thanks to see if you also have the same problem.

Hello there hsin-yen,
If you are still seeing this unexpected ripple effect in the upper right corner of your screen, I would recommend these troubleshooting steps from the following article if it doesn't look like a physical issue:
Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
You can reset the Mac's parameter RAM and SMC.Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
If that does not resolve the issue, or it is a physical distortion, I would use these steps from down the bottom of the article to seek service:
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Note: Diagnostic fees may apply for issues not covered under warranty or the AppleCare Protection Plan (APP).
Thank you for using Apple Support Communities.
Cheers,
Sterling

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