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So my boss brought his old desktop in today and complained about the screen going "all weird".
Indeed the picture is distorted and doing all kinds of weird stuff. After opening it up and re-inserting the video card, the picture is better, but it becomes worse over time or if the machine is moved (i mean just a light tap to the machine, not picking it up and moving it literally).
I've eliminated most causes (faulty cable, faulty cable-connectors) so it appears to be the videocard itself. I saw that the fan was missing a blade or 2, so it could be overheating.
But given the fact that even the slightest nudge to the machine or the cable results in immediate increase in distortion, regardless of how long it's been running, i'm thinking it must be something else.
Is is possible that the problem is on the AGP connector on the motherboard? because i'd hate to order a new videocard and experience the same problem. Unfortunately i have no other AGP cards the size of a radeon lying around to test that.