Hi
If you are thinking of looking inside the psu case to see if you there is a fuse which has blown
You need to consider the safety implications
The capacitors can maintain high voltages for more than 24 hours.
The voltages are enough to cause elecrtric shock injury
I would wait 48 hours after disconnecting from the mains before opening the case
About 20 years ago i built a system and did not check the switch was set to uk voltage of 240
The fuse blew and it seemed to be working again after changing the fuse.
Regards
Michael Barnes