Lightning strike diagnosis

While I was away from home, my family says a storm came though and lightning struck closeby. My computer seems to be dead. No lights, no nothing. I tried shorting the power switch pins on the motherboard to see if the switch was faulty, but no luck.

There is about 5 volts on the purple wire on the 24 pin connector from the psu to the MOBO, and about 2.7 volts on the green wire with the plug disconnected from the motherboard. No other wires show voltage. The psu does power up another computer, but I didn't take the time to swap everything over to see if it runs the old box perfectly.

Can anyone point me to a systematic way to check each component without simply buying replacements? While I suspect the motherboard is likely damaged, is there a way to check it? There aren't any obvious signs of damage, no scorching or strange smells.

Many thanks for taking the time to read this...

Thanks for taking the time to respond TonCharr28,
I was able to get the power supply to power up another system, so according to what I read in another post about output votages, it appears to have made it through unscathed. I tried to boot the motherboard by shorting the pins for the power switch, but didn't have any luck. Armed with that information, I decided to order a replacement motherboard which should arrive early next week. I'll begin by seating the cpu and memory and see what happens. I'll post the results, hopefully on the problem system. Thanks again..