Mother Board failure

Please help!

I built my first computer 4 months ago:
Core i5 4460
ASrock Z97 Extreme 3
Corsair Vengence 16  GB x 2
EVGA GeForce  GTX 970 4 GB
EVGA SuperNova 80 plus Gold 650 W
WD 1TB HDD
Samsung 500 GB SSD

Everything has performed admirably until two days ago we had a storm that knocked out the power and then came on for a second before going back out before I could turn off the PSU.  The cmputer was in sleep mode at the time of the power flux. Since then I have been unable to turn on the computer.
I searched for fixes on the web and found very little. I was able to narrow the problem to the MOBO by using the MOBO bypass tool that came with my PSU. It worked fine after bypassing the MOBO.
I also found some reference  to clearing CMOS using the jumper and then directly shorting the reset switch on the chassis which do nothing. I sent a request to support but no response yet. I rely on this computer for most of my days work.
Can anyone help?

Tom

Xaltar,
Thank you for your rapid response. I will try all of your suggestions. Where would any residual power come from?
If this does work how can I prevent it from happening again?
When I do power it back up do I need to remove the board and POST it like I did for the original build.
I only have the ATX cable and the CPU cable attached to my PSU do I need to hook up all the connections?
I realize these are a bunch of questions, but I am kind of flying in the dark so to speak.
Before making my choice to buy this board I had read all the reviews I could and the biggest complaint I found was this scenario, but it seemed to be batch related. So I held my breath for the first 29 days hoping that my batch would be a good one and I wouldn't have to RMA it back to NEW EGG.
One last question how is the best way to power off the computer?

Thank you so much.
Tom

Thanks again,

I am an amateur radio operator so I knew about the PSU having capacitors large enough to hold a charge but I never expected the mother board to hold one.
My original intent of the question was in normal use how is the best way to power down a computer:
the on and off switch, on the case, the PSU on and off or the surge protector? Also I had forgot about the 8 pin connector.
I am hopeful for a cure.

Tom

This is great information. After the regular shut down should you off the PSU?
(got abouty 2 more hours before I can try the hopeful solution.)
 It makes great sense that ASRock would put a protection in the board, but I would expect that there should be a more direct way to reset it. If this is the case I will do my best to put a review out there about this and maybe help to clear some the tarnish from AsRock's name that seems to prevail in most of the review sites I have seen.

(Fingers crossed)

Tom


Edited by tcvalley - 17 May 2016 at 12:01am

Sadly the procedure failed. In process of RMA. What constitutes a decent UPS?
Thanks again for your advice and effort.
Tom