Did you reset using the button and not Safe Reboot combo (L2+R2+Start)?
Using reset button can corrupt your system. Make sure to backup anything you need and just reflash.
If you can hear sounds but the screen stays black after the boot, increase the brightness(a lot) with menu + vol Up
Performance is just fine after a reboot as with a fresh boot. If not, there’s something wrong on your end.
I don’t know in what scenario you are taking your card off, but everything, including the system, is running from the sd card, so without one, there won’t be content.
if you used the reset button, maybe something got corrupted in the process, re-flash the system then.