Black Screen

[LunaMoo]

Can't say much from the information you gave, but if you get a black screen with default settings(PPSSPP system settings - "Restore PPSSPP settings to default") it means either your game backup is messed up(since corruption can happen on pretty much all storage devices, dying hdds and flash drives are common cause of corruption) or your system is messed up.

In the latter if you checked all graphic backends I kind of doubt it would be gpu drivers since they're separate for each api and you would really have to have some luck for all of them to be broken the same way unless it's a hardware failure. Could as well be some third party software that messing things up, like that overlay you use to display timer and temperature.