Sytem won't detect array

I've had the system set up and running fine as a standard non-RAID.  Set up RAID 0 and all worked OK.  Then (big mistake) tried to set up RAID0+1.  Now, when I enable RAID in BIOS, enable RAID on SATA3 and 4, save and close BIOS menu, system restarts, gets to "detecting array" and hangs - forever....  The only way out then is to turn the power off, clear CMOS and rest the BIOS to conventional - ie non-RAID.  Everythg then works fine again.  I've been thro this several times - always the same. I even sent to board back, returned as "fixed" but same problem. I tried another K8N Neo2 board - same problem.  So - its not the board, but if it's the drives or cables - why did it work on RAID0 and what's gone wrong since?  I assume I'm doing something wrong....  
I've noted my deficient power supply issue, but all is otherwise well and again - if that's the problem why did it work the first time??
I've searched the forum but didn't find any problem quite like this.  MSI just tell me the board is fine.
Thanks for reading

No - still get stuck in the same place - on start-up, DETECTING ARRAY. Then nothing happens.  I've waited about 20 minutes and still no go - surely that's long enough?
So, to reiterate, I had it running with RAID0.  Tried to set it (in error I now know) to RAID1+0 (but would still like it on RAID 1).  Ever since I cannot get into the RAID config utility and so am left with a "standard, nonRAID 2-drive system.  I have tried a very prolonged reset (>24 hours) NO GO.  , IN the on board devices section of the BIOS, I have enabled RAID, and then enable SATA3 and SATA4 only (not SATA1 or 2, and none of the IDE options).  Boot order is floppy, HDD, CDROM.  I have tried the ordinary power leads for the HDD rather than the SATA ones (getting desperate) NO GO. The CDROM is now on the secondary IDE channel - NO GO.  I tried a new mobo - NO GO  If I disconnect the drives, it takes a few minutes then flahes up (correctly I guess) "no drives detected".
I'm at a loss to know where to go next.  It guess it must be something to do with the drives/leads as replacing the mobo gave the same error.
I could flash the BIOS to 1.41 or later (currently 1.4) which would as I read the various posts on this forum upgrade the RAID bIOS to 4.66 (currrently 4.6).  After that I guess I could try new leads or even drives.  THe only other thing is the PSU, but then why did it work before - and no problems running a standard system since - anyone got any thoughts?
Thanks
Chris  

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