How fast would our technological world shut down if most of us died?

In the event that MOST of the world population were wiped out in a plague / apocalypse that did not directly destroy infrastructure, just killed the people, how long would infrastructure like the power grid, phone network, internet, gps system continue to run?

Would nuclear power stations meltdown or do they have automated safety shutdowns?

Just to be clear i'm talking about a plague that kills 99.9% of the population of earth, leaving just 6 million people alive spread around the world.

If those 6 Million people can start again with a clean sheet and the technologies of 2016 I would imagine that they could re-build a world that would be OK, but if they are reduced to medieval levels of tech its a tougher place to be...

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How fast would our technological world shut down if most of us died?

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