Panpsychism doesn't claim that everything has complex sensory perception, higher reasoning, memory, etc. The hard problem isn't about any of those things, which indeed have clear neuronal correlates and can easily be turned off.
The idea is that there's always "something that it's like to be X", where X can equally be a conscious human, an anesthetized human, a dead human, or an electron.
The idea is that there's always "something that it's like to be X", where X can equally be a conscious human, an anesthetized human, a dead human, or an electron.