Continuity on F1 is a good thing, cause F1 is a fuse… and continuity shows: it’s not blown.
D5 is a diode. So continuity on D5 is a good thing too – but only in one(!) direction. There should be no continuity if you switch the probes on D5 (to test continuity in the other direction).
As far as i remember (someone correct me if i’m worng), the voltage regulators U5 and U6 are directly connected to the 5V input. So it’s very likely you’ve fried one of those two by connecting the wrong power supply.