Got a couple of these power supplies in. Both dead. one of them had 5V standby, the other one does not. 

Both have good fuses. 

This post is about ONE, as I only got the parts for one so far. 

Basically, if your fuse is good, but your missing your 5V standby, IC1 is likely shorted, and R4 blows open when IC1 shorts. R4 is the fusible resistor to IC1, and IC1 is a self-contained chopper mosfet, and SMPS controller designed specifically for standby power supply output. 

These ICs are discontinued, so you gotta scour ebay for NOS supplies. 

After changing out those components, the power supply fired right up. no problems.