Mobo or RAID 0 unstability?

[wolfman140]

Hey everyone,
   From what I've read, as far as RAID 0 unstability goes...if she goes down, she really goes down.  WHich isn't what I've been experiencing...
    For no reason, lately my computer has done these crashes to a black screen.  All of the components, fans, and drives are still active, but my screen blinks and goes to black sometimes.  This is happening more and more when I boot up my computer.  The BIOS posts, and then as I'm about to load windows it goes to blackscreen and doesn't recover.  When I DO get into Windows, it holds its own 90% of the time.  
            At first it might be the RAID 0 w/ two SATA150 W.D. drives because I isntalled it about 4 months ago and read that some said they were unstable...But the posts here look like if its unstable, it all goes to *censored* and you need to reformat and such and thats not my case.
   So my second conclusion is its the mobo.  It's an Asus P4S800D-X.  (  I originally bought it to rebuild my Dell so I didn't want to spend a lot of cash, it was about $60.  Later, I read that the SiS(964?) northbridge chip wasn't a reputable one and was unstable (as I discovered that my board couldn't handle much OC'ing)
     SO...my question is if this behavior sound like a mobo problem, and is my cheap board/chip the cause of it?  

PS - The RAID controller I'm using is the onboard SiS chip on the mobo (another reason to have worry)

SPECS:
P4 2.66Ghz socket 478 w/out HT
2 gigs of DDR400 (Crucial)
Audigy 2 ZS
Nvidia GeForce 6200
Rosewill PSU
Asus P4S800D-X mobo
2 x SATA150 Western Digtal (74g each) in RAID 0

[Backdated]

As I think you already know, this one is just too difficult to call as both possibilities are so intertwined.

[2k_dummy]

What are the specs on that PSU? Suspect?

[wolfman140]

Rosewill RV350 ATX 350W Power Supply 90-135 vrms or 180-265 vrms switch-selectable CSA, CB, TUV, FCC, UL - Retail  

That's the psu..I doubt its the psu because all of the components are running and such and its not like there's a flicker of power when it happens.  The screen just flashes black as if it was being turned on and then thats it.  
   Other suspicions that lead to the mobo and not the hard drives is another odd factor...While I was playing WoW I plugged my mic in and out of the ports in the soundcard to find the right one, and THAT made my comp crash...Just by pulling out the mic jack and putting it in.  ALSO, whenever I tried to burn a certain DVD, the computer would do the black screen thing.  Symptoms that are spread this far apart from sound jacks, bootup, dvd burning, etc...Just sounds like its a problem in the heart of it all, the mobo.