MSI Motherboad destroyed by PSU...Replace everything?

Comp Specs :
CPU - AMD FX-8120 X8 3100MHZ 16MB 125W AM3+
DVD - Sony Optiarc 24X DVDRW SATA OEM
RAMx2 - Corsair XMS3 4GB PC10666 DDR3 1333MHz
HD - Seagate 500GB Serial ATA HD 7200/16MB
PSU - Diablotek DA Series 600w ATX Power Supply (First Replacement)
GPU - Sapphire Radeon HD 7770 GHZ Ed. 1GB DDR5 (Second Replacement)
Motherboard - MSI 970A-G46 9 Series AM3+(About to be 3rd Replacement)

Long Story short :
I bought a Bare Bones Kit from Tiger Direct.
The first build went fine and everything was great! :)
Then the PSU died. It was replaced.
Then the monitor would randomly drop out. It was replaced.
Then the monitor keeps dropping out. Replaced the GPU.
Monitor STILL drops out. Less than usual, but STILL randomly. Sometimes games, sometimes movies, sometimes web, sometimes immediately after reboot.

My theory :
The Original PSU dieing shorted out the GPU, and the Motherboard.
I have trouble shot the problem, replacing the PSU, Monitor, GPU, it has to be the Motherboard.
Am I assuming correctly?
AND Should I replace my anything else in order to avoid further issues? Such as RAM or the HD? Maybe CPU?
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More about motherboad destroyed replace everything
  1. the one thing about tiger directs barebone kits is that they will always throw an extremely low end psu at you to use. their barebone kits usually don't include a gpu for such reason, because the psu isn't that great to handle middle ranged cards. Though the monitor in question shouldn't be affected by the psu, that's a problem on its own.
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