Reply #4: Does this happen in every room at the same time?

[Warpy]

If this is the case, then the problem is the line coming into the house having a connection that's worked loose, either on the pole or at the meter. Every time the wind blows or a bird lands on the wire or takes off, your lights blink.

Lights blinking on and off in only one or two rooms at a time is a different problem, and that means you'll need to get your wiring checked. This isn't anything that can be ignored.

In any case, you need an electrician. It would also be a good idea to update your board to a circuit board rather than that fuse box. Circuit breakers react more quickly than fuses do and can save your house from burning down.