Laptop has garbled picture on internal screen and external monitor

Problem description:

The laptop has garbled image on internal screen and external monitor. In some cases the

garbled image appears as soon as the laptop is turned on. In other cases the video works fine in safe mode but not in normal mode. But the image always fails on both the internal screen and external monitor. Reinstalling the video driver doesn’t fix the problem.

Possible cause:

1. Shared memory failure.

2. Video card failure.

Possible troubleshooting steps and repair solution:

1. If the laptop uses shared video memory (part of the main memory is used for the video purposes), it’s possible that you have a faulty RAM stick. – Test your laptop memory

with Memtest86+ and if the test fails, replace the RAM module. – Test your laptop with a known good RAM stick and find out if it fixes the problem.

2. In new memory doesn’t fix your problem, most likely you have a faulty video card. In most laptops the video card is integrated into the motherboard. When the video card fails, it’s necessary to replace the whole motherboard. In some laptops, the video card is a discrete module and could be replaced separately from the motherboard.

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