Need some help with a SATA drive

[User Needs]

I have a ASUS SK8V M/B with a 80G SATA drive with the O/S on it.
And the O/S is MS home server beta!
But when I put a new 250G SATA drive in I get No hard-drives detected at boot.
If I pull the 250 out, the HD is detected and I can boot off the 80.
Any ideas on why this is happening?

Thanks
UN

[DoG]

Are both drives the same SATA spec (SATAI, SATAII etc)? And have you disabled the raid option in bios?

[User Needs]

Quote:

And have you disabled the raid option in bios?

Tried it both ways, still nothing!
And both are SATAI

[User Needs]

O.K This was been fixed!
It was a simple case of trying to run a SATAII when I only have SATAI.
Down graded it to SATAI and off I go