The boards BIOS should not reference the partitions at all as this is done by software (ie OS) not the bios other than to identify the drive find its active partition and run the bootstrap.
It may be that your bios needs a newer firmware to recognize the drive correctly, or you could try manually entering the Cylinders, Heads & Sectors like the good old days, but IMO a bios update would be the thing to do.
It may be the operating system has not recognized all the ports, if you operating system is now ok, go to my computer>properties>hardware>device manager, and look to bottom of the list to USB Controller right click on them, and Uninstall all controllers and restart pc and see if all the ports are recognized and installed automatically. If you need more information, reply me soon.
Remove cmos battery and then replace it after 3 mins or so, Try rebooting If no luck, remove ram modules one at a time and retest unplug all but hdd and power connector to mobo, cpu and hard drive and retest.
failing that, could be a surge of electricity has damaged your mobo
You can download the drivers from ASUS WEB site. Select
your model motherboard/computer/laptop, and make sure you select the Windows XP
or Vista version of the drivers that matches your Windows operating system.
Please click on this link to their WEB support site : - http://support.asus.com/download/download.aspx?SLanguage=en-us
no need to modify anything just plug in the 20 pin mb power connector the 4 pin cpu connector and your HDD's and disc drives power the same as your old setup and your good to go. mb's are designed to handle a broad range of wattages, if your not sure what plugs go where take a few photos before you begin unplugging or draw a simple diagram
