When I pull up the bios the two ide hard drives are recognized by the system correctly as master and slave but system wont BOOT up and gives me the message No drives attached.  Any ideas??  ThanksConnections....make sure your connections are secure and your jumpers properly set.I believe the connections are good and jumper settings are correct because they are recognized correctly in the bios menu.  I even switched the two drives to make sure that the bios was reading them correctly and they did in fact switch the master and slave.  I have since switched them back to the way I need them and they again are recognized correctly in the bios....Here is my exact message:

"MBUltra133 (PCD20276) BIOS is not installed because there are no drives attached"
even though it detects the two drives!  Blue screen of death if I try to boot into winXP  from the cd drive...Go into bios and see if raid is enabled and if so disable.Forgive me if this is a bit ignorant but all i see in the bios is the raid/scsi boot order.  I don't see any option for disabling raid.  I TRIED to boot up the system with both boot orders and ended with the same result. If you have any more ideas please let me know.  Thanks for all your help thus FAR!! Where are these drives from ?
Do they have an OS installed on them ?
What was in this machine originally ?One of the drives was originally from this machine, its a western digital 40G and the other is a maxtor 80G drive that came from another machine.  Neither of them have an OS on them, as I recently formatted them both in order to do a clean install of XP pro.  I have even tried just using one of them at a time to see if I could get the setup feature to start from the XP disc.  The dvd drive is also located by the bios and I put it into another machine to be sure it worked correctly and it did.  I was THINKING of installing the OS on one of the drives in another machine and then installing it into the one giving me trouble.  Would this be a waste of time??  Thanks for your help..Try the 80G first...jumper it as Master
Ideally it should be on it's own ribbon cable.

MBoard==========================Slave=======Master.

See if this works.That is the setup I have been trying, I even only put in the 80G on a ribbon cable with no slave attachment and recieved the same error message.  I don't understand how it can be read in the bios menu but not during boot up...How were they formatted ? ?
Also try it on the other IDE channel even if you have tyo disconnect the optical drive for a bit.I formatted them under NTFS .  Do I need to change anything in bios if I use a different ide controller?disable the RAID Controller

http://www.google.co.uk/search?source=ig&hl=en&rlz=&=&q=MBUltra133+%28PCD20276%29+BIOS+is+not+installed+because+there+are+no+drives+attached&btnG=Google+Search&meta=lr%3D&aq=f&oq=No.Thanks patio, you are the best.  Just needed to clear the cmos and load optimized defaults, change boot sequence and XP is loading as we speak.  Thanks so much for your help!