OS Boot failure

Hi,
I lost about 20 hours without any luck. Help!
I have p5n32e-sli mb with 2 hd. Yo inprove performance added 2 raptors in raid 0. Reinstalled OS but pc wouldn't boot without installation cd in drive. I've changed configuration many tames, got rid of raid - installed in individual drive - same story. Tryed XP pro and Vista. Alvays the same error: non system disk.
Any ideas?

 

I would look into a possible BIOS flash/update. Here's the link to your motherboard's downloads:
http://support.asus.com/download/download.aspx?SLanguage=en-us&model=P5N32-E SLI
If you look thru the different versions of BIOS that are available, you'll see that there are quite a few since the initial release, and MANY bugs have been fixed. Use the newest non-beta BIOS, it's version 1205. The beta BIOS's can be a bit tricky, and it is a beta, so it hasn't proven itself as 100% kosher just yet, so stick with a tried and true release to avoid more problems. And just to clear things up.... the PC was running fine, then you added the 2 Raptors, and now you have these problems; did I get that right?

 

You got it right

 

THANKS!
Just flashed the BIOS - it works!