Samsung LC27A550US/EN manual Troubleshooting Guide, Testing the Product, Check the followings

9Troubleshooting Guide

9.1Requirements Before Contacting Samsung Customer Service Center

9.1.1 Testing the Product

Before calling Samsung Customer Service Center, test your product as follows. If the problem persists,

contact Samsung Customer Service Center.

Check if your product is operating normally by using the product test function.

If the screen is turned off and the power indicator blinks even though the product is properly connected to a PC, perform a self-diagnosis test.

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Power off both the PC and product.

Disconnect the cable from the product.

Power on the product.

If the Check Signal Cable message appears, the product is working normally.

If the screen remains blank, check the PC system, video controller and cable.

9.1.2 Checking the Resolution and Frequency

For a mode that exceeds the supported resolution (refer to "10.3Standard Signal Mode Table"), the message Not Optimum Mode. will appear for a short time.

9.1.3 Check the followings.

Installation issue (PC mode)

The screen keeps switching on and off.	Check the cable connection between the product
	and PC, and ensure the connection is secure.
	(Refer to "3.2Connecting and Using a PC")
Screen issue
The power LED is off. The screen will not switch	Check that the power cable is connected
on.	correctly (Refer to "3.2Connecting and Using a
	PC")
The message Check Signal Cable appears.	Check that the cable is properly connected to the
	product. (Refer to "3.2Connecting and Using a
	PC")
	Check that the device connected to the product is
	powered on.

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