1. Reason Analysis:
1. The data cable connecting the monitor and the host may be loose or broken, leading to poor contact, or the monitor may be broken.
2. The metal strip of the graphics card inserted into the motherboard slot may have fallen off, rusted, or broken.
3. The metal strip of the memory stick inserted into the motherboard slot may have rusted, fallen off, or the memory stick may be broken.
2. Solutions:
1. Check whether the data cable is loose or broken. If there are no signs of breakage or looseness, try connecting the monitor to another host for testing.
2. If the monitor and data cable are confirmed to be fine, then consider the graphics card. Open the case, disconnect the data cable from the graphics card, and remove the graphics card from the motherboard slot to check if the metal strip is loose or rusted. If rusted, clean it with an eraser; if loose, consider replacing the graphics card.
3. If the graphics card is fine, check the memory stick on the motherboard. Listen carefully for any beeping sounds when starting the computer. If there is beeping, turn off the computer, remove the memory stick, clean the metal strip with an eraser, reinsert the memory stick into the motherboard slot, and restart the computer. Listen for any beeping sounds during operation. If there is none, the poor contact issue with the memory stick is resolved. (Some computers may not emit a beeping warning regardless of the presence of memory, so if both the monitor and graphics card are fine, directly remove the memory stick, clean it, reinsert it into the motherboard, and restart the computer to see if the problem is resolved.)
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