What would happen if the astronauts on the ISS stopped maintaining it, and no further vehicles or remote control commands were sent up from the ground? I'd like to know what systems would stop working, what would burn out, fail, jam, freeze, overflow, etc, at what point the astronauts would die, and in what order the station would break down into a heap of unrecoverable junk.
To prolong this experiment, let's assume it was in a much higher orbit so orbital decay wouldn't become terminal for hundreds of years. I am just interested in the process of decay, and if/when a steady state eventually gets reached, what would be salvageable and what would be ruined.
If you can, please format an answer as a rough timeline or chain of events, with guesses as to the durations, and comments on interesting events where appropriate. Answer should include much info on the main life support failures, but also cover the other subsystems, and can span hundreds of years if necessary. Please include: power generation, truss bearings, cooling, stations attitude, pressure, water and o2 content, long term viability of electrical systems should power ever be restored.. What is no longer salvageable and repairable after 10years, 20, 50..