Question

why should we not put a magnet near a television or computer

Answer 1

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$\mathfrak{\green{Answer:}}$Because there is nothing magnetic about flash memory, it is completely immune to magnetic fields. Cables can be affected by magnetic fields while in use if the cable isn't shielded. Ribbon cables, for example, usually aren't shielded, making it possible to cause interference.
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Answer 2

Magnets can only harm televisions with a display tube in them. This is because tube televisions use an electron beam to "paint" the image on the backside of the screen. This electron beam excites phosphors which give of light. There are three different types of phosphors, one each for red, green, and blue.