Not necessarily the PSU but more likely the motherboard if the PC had been running at the time of the surge. The only way to find out is to remove all the devices as if a new build, remove all the cables from the motherboard, only have the onboard video out and the ram and the PSU cable connections.
Do a ram check, one stick per slot laternatively until you get it working. If still not working it might be a fried ram slot or ram stick/s.
If you cannot get a display, the defaults for the bios would have been initated, the onboard video out would be the default, change the cable to vga out. If you still cannot get a video out display, it could be the motherboard at fault.
Turn off the Pc from the powqer point for a minute then turn on the mains power, power on then see if the bios reports the date time as incorrect. Go into the bios, change the date & time to curtrent then Save & exit. shut down the PC. Turn off power point for a minute then turn on Power ppoint and power on PC. If the date & time do not hold their configuration, your cmos battery is flat. Replace with new and start the procedure all over again.
If the date time does not hold after a new cmos battery it is not necessarily a problem (yet) some bios utilities requires other settings to be enabled before it accepts the Date & Tiime as being stable. Check your other options like boot order, disable Wake on Lan, disable Floppy boot (if it is an option) etc.. then do the procedure all over again. If the date time hold then the motherboard is good to go.
If, after all that, you can't boot to hdd, it's possible that the hdd has been "fried" or the structure of the file system has been corrupted, usually happens in a power outage if large files are in use, pc gaming, video editing or a copy/paste was in progress.
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