After installing my BIOS upgrade, my IDE drives are not being detected.

Enter the CMOS setup and go to the screen labeled 'Standard CMOS Setup'.
Make sure that all of the drives are set to Type: Auto and Mode: Auto.
Then hit the escape to return to the Main Menu and enter the 'Integrated
Peripherals' screen. Make sure that the 'On-Chip Primary IDE controller'
is set to Enabled.Be sure to save the settings before you exit.This should
take care of your problem.

The BIOS will not detect your drive if the cable connection is not
correct. If you are using an Ultra ATA cable (80-conductor) make
sure that the Master or Single drive is on the black end connector.
Connect any Slave device present to the gray middle connector.
Finally, the blue end connector should be connected to the
motherboard or EIDE controller card. If you are using a standard
40-conductor data cable, connect the Master device to one end, the
Slave to the middle and the other end to the motherboard. In all
cases, make sure that pin 1 on the data cable is aligned with pin 1
on the motherboard and pin 1 on the drive. For Western Digital
drives, pin one is located closest to the power cable.


Incorrect Jumper Settings will also prevent the BIOS from detecting
your drive. The most common incorrect jumper setting (For a Western
Digital drive) is for a drive that is alone on the data cable. Keep in
mind that the concept of Master/Slave applies to a given EIDE channel. If
there are two drives on the data cable, one must be Master and one
designated as Slave. If the drive is the only device on the cable, it
should be jumpered as a Single drive, NOT a Master. To do this, place a
jumper shunt on pins 4 & 6, or remove the jumper shunt completely to set
the drive as a Single drive.of Master/Slave applies to a given EIDE
channel. If there are two drives on the data cable, one must be
Master and one designated as Slave. If the drive is the only device
on the cable, it should be jumpered as a Single drive, NOT a Master.
To do this, place a jumper shunt on pins 4 & 6, or remove the jumper
shunt completely to set the drive as a Single drive.

If the hard drive light comes on and stays on, make sure that the cable
is connected correctly at both ends. make sure the power is connected and
that when power is turned on you can hear the drive spin up. (the sound
may be quiet but still noticible.)