When you say system reset, do you mean just turned it off?
There is a sort of "return to defaults" reset you could try (which doesn't wipe anything, just resets system settings).

Turn the ps3 off by the power switch at the back, and hold the power button on the front. Whilst still holding the front power, turn the main power back on. It will beep a few times, then you can release. It should auto detect your av settings.