I find that usually when I have problem with even resetting, it is because I let the battery get too low; it's almost like the Sony has trouble charging from USB when it is too low on power. I think there's not enough power to charge the CPU long enough for it to complete the handshake or something.
Luckily, I have a Sony PSP charger and that works a treat because it can charge even if the system isn't up and running. I haven't seen that problem since.
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