there are a number of beep codes that refer directly to what your problem is,, you would have to search for Bios Beep codes ,,, sorry I dont have a link right now,,
( quick one I had in my favs)
on the PSU,, I hope for your sake that there was a short in the unit and not a surge across the MOBO,, check ALL the capcitors closely, with a magnifying glass and good light,, look for bulges , charring, burnt stuff,,,
then your hardware,, problem here is that troubles might not present themselves easily or notably,,, I had a pc that got zapped in a lightning storm via the modem line,, I thought it was ok,, booted,,apps all opened,, trouble was that under a load, i would get lock ups, glitches in display,,crakly sound,etc,,
the MOBO was fried, and my sound card,,,,
Not to sink your boat,,but you MAY have some problems with things or you MAY not??
Only when you have a functioning unit will you be able to ultimately discover any hidden damage,,