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I don't think we'd wean ourselves off computers ever, but the potential impacts can be huge - just look at how much their recent computer glitch has cost Natwest.
To some extent, the internet was originally conceived as a resilient network which can route around broken links and routers.However, a widespread impact from events such as you describe could disconnect large sections of the population from communications. Our city-based society is rather fragile, and working on very lean margins - the average supermarket only stocks a few days of food. Without effective transport, communications, electricity, water/sewage and banking systems, things could get very bad, very quickly.Geomagnetic storms can damage the electricity grid and cause widespread blackouts: http://en.wikipedia.org/wiki/Geomagnetic_storm#Electric_gridMilitary actions could cause EMP: http://en.wikipedia.org/wiki/Electromagnetic_pulse...and terrorists are always looking for vulnerable spots in the fabric of society.Fortunately, the military has equipment designed to be used off-grid in electrically hostile environments, so they could do some coordination in many of these conceivable scenarios.