[fractallyte]

This has been addressed quite eloquently in John Wyndham's "The Day of the Triffids", and elsewhere. 'Civilization' would last at most 2-3 generations before reverting to a pre-industrial stage. There simply wouldn't be enough people or infrastructure to maintain manufacturing or industry.

There'd be an inevitable decline, and eventual loss, of technological skills, as people would concern themselves more with everyday survival than the 'luxuries' of modern civilization.

Hence, no replacement parts for the inevitable damage to your device(s). And, of course, no power supply.

What we REALLY need is an Asimov-style 'Foundation', with all the accumulated knowledge of humanity, and methods for bootstrapping a society from stone-age to silicon-age tech...