I had a tv plugged into an outlet controlled by a wall switch. Turned it off one day by accident and turned it immediatly back on.
Fried the TV.
I would be very worried that your "momentary power interuption" will kill your MB and/or HD and/or CPU and/or PSU and/or GPU and/or...
Take a read at other post regarding power interuptions and hardware life expectancy.
In your case it sounds like you need a new higher wattage PSU with enough amps on the 12V rail.
edited for fat finger spelling errors