Why am I a thin blue vertical line on screen?

Why am I a thin blue vertical line on the screen of my PrecisionM4800

.? Is there problem with Video card?

Hello Karthi.SK44,

Thanks for writing on the Dell Community Forum.

I suggest you to test the display on the external monitor to confirm if the screen is bad on external monitor while the motherboard is faulty.

Then run LCD BIST (built-in self-test) on the system to shut down the system, then press and hold the power button. Then put on the system where, in solid colors will be visible on the system. If the line is visible during the test, then the screen is defective.

If these two tests pass and then make sure that the system ins safe mode with network to eliminate the operating system.

I hope this helps. If there are questions more respond to this message.

Nice day!

Sincere greetings,

Tags: Dell Laptop

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