I hope your dad understands that XFX is a great name in PSUs since they're heavily based on Seasonic units. A defective unit could have failed under stock CPU settings while you were gaming. What would he say then? Don't play games any more?
$hit happens. If you can't reason with your dad, try offering to buy a new PSU yourself. Oh, and don't let your dad take that PC to a computer shop "to get it fixed." They'll stick in some piece of $hit Thermaltake $60 unit with just enough juice to run your comp at stock. That's another "bang" waiting to happen.
For the record, OCing is safe. Your particular OC of 3.6GHz is a walk in the park which likely didn't even require budging from stock CPU voltage. Heck, I've OCed my Intel 860 to 3.6GHz for everyday use AND I've in fact UNDERvolted it!

