MSI K9N2 Plat - Weird boot issue

When I hit the power button on my pc, fans power up, bios shows up on monitor, and I can hear drives spinning. After about 2 seconds, everything will stop (like it lost power or was reset), then after a second, it will reinitialize everything (fans start spinning, etc. - I call this the "2 boot") Then it will either bootup normally or bootup without video - the monitor never "wakes up" and the light on the monitor is amber. It seems like the pc stays up and running though. When the latter happens, I do a reset and it works fine without the "2 boot" process occurring. I can game for hours fine and my temps are great when it boots up and after playing BC2 for two hours. Sometimes this is every bootup, sometimes not as often.
It definitely seems hardware related but I'm not sure if this is the PS, Video card, memory or even the board itself. I don't have extra parts or another PC to try these out in. Any suggestions for narrowing this down?
My thoughts for the memory are to run memtest, but I'm not sure how to test the mobo, video, PS. Is this something in the bios? Some setting I need to check?
Someone suggested there might be an auto voltage adjustment? When I built the rig, I believe I told it to just use optimized defaults. Since then, no changes to bios.
MSI K9N2 Platinum
AMD Phenom 9850
BFG 8800GTS
OCZ 700 Watt PS
4 gigs ddr2 800
Not OC'ing
Thanks for any help.

https://forum-en.msi.com/index.php?topic=137105.0
Didn't want to bump an old post.
Symptoms: (maybe 3-5 times/10 boots)
1. Hit power button on case
2. Fans spin, lights come on, no post
3. PC shuts off
4. PC turns on
5. PC either:
   5a. Boots up fine, no problems
   5b. no post, reset fixes this
Symptoms: (maybe 1/10 boots)
1. Hit power button
2. Fans spin, lights come on no post
3. Reset fixes this
Troubleshooting:
1. Set bios to load fail safe - still have the problem
2. Removed PCI-E GPU and booted off onboard video - still had the problem
3. Did the paperclip test with the PSU with 3 x 120mm fans, 1 x 200 mm fan, and one floppy. Tested fine with 10 tests
4. Removed motherboard and ensured nothing was touching case, verified standoffs - same problems
5. Redid/reseated all connections/cables except CPU
6. Ran memtest for 4 hours - no problems with RAM
Besides hardware, my only other thought was a bios update. I do have a Zalman CNPS 9700 CPU Cooler and perhaps I damaged the CPU when installing. I think I tossed the OEM fan so I can't test with that.
MSI K9N2 SLI Plat
AMD Phenom X4 Agena 9850
BFG 8800 GTS 512(G92)
2 x 2gb GSKILL DDR2800
Corsair 750TX PSU
At this point, I believe the problem is either the mother board or cpu. Does anyone have any other suggestions on testing or if I'm not diagnosing this properly/headed in the wrong direction?
Thanks for any and all help.

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    Artic Cooling Fusion 550, 550W, dc outputs are mentioned below
    and some minor components (optical drives, wifi card etc.)
    I started the computer and everything seemed fine. I managed to enter the bios. I was checking H/W monitor and several other options, I didn't change anything. Suddenly (after circa 5mins) the computer shut down and started to turning on and off repeatedly. I stopped the loop by turning off the power supply. I started it again, however it got stuck in the loop imediately. After a while I managed to access the bios again, meanwhile I was trying to find some answers on internet.
    I decided to remove all memory sticks (as a lot of topics here in forum which are describing the very same problem sign RAM problem) and started computer. I expected beeps and LED-show. However, the computer didn't start at all! Even fans were not spinning, just nothing (although PSU was giving tension). I put RAM back and computer started. It was like black magic. I tried again, remove RAM - no start, put RAM back - no start too. Mobo went definitely dead. So I RMAed it.
    I've obtained a new one, which was:
    MSI P55-GD65, rev. 1.0, BIOS 1.2, Foxconn socket
    I put all the stuff together and started computer. Everything went fine, I managed to enter the bios. Nevertheless, I decided to check RAMs for sure; I changed booting devices, restarted and booted system rescue cd with some utils. I started memcheck basic test. The basic test was fine with no errors, then I started filling with random pattern test. It ran for almost 24h. I wanted to try another exercise test and... computer shut down and the loop was there once AGAIN!
    I don't think the mobo is the issue here anymore. I bet on two things: PSU or RAM (I'm not going to think about CPU!)
    I don't recall exact dc ouputs but: AC Fusion has 2 12V rails with 17A each. Mobo needs 18A, but as I understand it, I have to check 2 rails combined against the requirement - 34A > 18A, it's okay, isn't it? I've choosen this one as I wanted silent PSU (it performed really good in tests, f.e.: http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3516). I don't have any other similar PSU to swap (neither my friends).
    My suspicion is the problem is RAM incompatibility. My RAMs (AD31600E002GU2K) have 1.65-1.8V working voltage. Maybe the mobo sets auto settings badly (I'm not present at my computer now, I left for the weekend); they are not in QVL too (http://eu.msi.com/uploads/test_report/TR10_1846.pdf). The problem is I was not able to get into bios before I left. As I read on the internet, P55 is pretty touchy when it comes to RAM. I'm thinking about swapping them for Kingston 2x2GB 1333MHz DDR3 CL7 (http://www.valueram.com/datasheets/KHX1333C7D3K2_4GX.pdf; which are not in QVL either, but KHX1333C8D3K2_4GX are; only latency difference).
    Any advices on the whole problem?
    P.S.: I've tried CMOS clear on the former one too, no change. As I mention I went through the most of the gd65 booting issues posts here on MSI forum and several others.

    Do you think Corsair VX550 550W could do the job? It has a single rail with 41A on 12V. ATi certified Straightpower BQT E6-550W for 5850, which has 4 rails per 18A, but overall 41A too (http://www.be-quiet.net/be-quiet.net/data/media/_stories/216/sp_e6_550_EN.pdf).

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