difference between reboot and reset

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so have arduino doing stuff in robot.  lose partial or full responsiveness arduino side of things.  have yet pinpoint problem, since doing lot of stuff @ once, 1 thing certain, functional sketch has suddenly, without mod or re-upload, ceased function properly.  powering on , off doesn't help, seemed re-uploading software solution, seems take several tries fix.  other day problem occurred again.  had robot working fine.  left alone afew days.  came back, didn't work.  turned off , on ton of times, never started working again.  next day, still nothing.  not having laptop, tried jiggling al lthe connections, nothing, hitting reset button on board seemed fix it.

question: difference between hitting reset button , powering arduino board on , off?  initiate ram clear routine, nothing special?

specifically mega r3.

as far know should same. other way round - power cycle more thorough button reset.

the avr chip should internal reset until power stable , oscillator running. can imagine board due variance of components , way of supplying/loading power such chip "starts early".

bad power may explain other sudden stops.  (and there possibility have real hardware fault on board, akin loose connection - unlikely, though)


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