My laptop has horizontal flashing lines across the screen. After a little while, the screen will freeze, while the audio continues to work, and fade to white. Is this a graphics card malfunction? If not, what is it and what can I do?

Given only your post, maybe. Does it look OK if you cold boot to the BIOS screen? If it's OK there tell me make, model and if you are keeping up with the usual 1st of the month canned air to the vents maintenance.

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