No hydraulic pressure indication on one side typically indicates DEU failure(DEU1 for HydA, DEU2 for HydB). You would probably have a CDS Fault annunciation as well(if on the ground).
I can see how DEU failure could cause the other issues as well, but I haven't personally noticed them in the incidents where I've had DEU issues. They were all on the ground, and MX reset the CB's for the DEU in question, waited about 3 minutes, and all was good. A total power down/power up would accomplish the same.