Update since posting.
Did not get an immediate response so went to Youtube and searched using dia gnosis repair Delta Electronics DPS-310CD ATX power supplies got ~ 197 resu lts. Then started watching the videos.
One thing mentioned was to wait a while for caps to discharge so decided to take plenty of time and waited until this morning to test.
First thing I did was to recheck all the caps for bulges or leaks. Found n one. Also rechecked for burn marks on pc board and components. Also found none. Still was unable to identify anything that looked like a fuse. Wou ld be nice to find a schematic for DPS-310CD. Have done some searching but to date have not found one.
Then decided to try starting. Followed the connect green and black wires o f main power connector
to start and was surprised that green lit e on PSU came on and got readings of 11.89V for yellow and black, and 5.15V for red and black wires of a parallel HDD connector.
Am wondering if 11.89V for HDDs is too low? I do not have a scope to check the wave form but the readings were stable on my meter.