1) Has BIOS setup been correctly configured for autodetection.
2) Are the jumpers on the drive set correctly.
3) Have the power cord and data cable been properly connected. make sure each is solidly connected at both ends.
4) Check the website of the drive manufacturer for suggestions. Look for diagnostic software that can be downloaded from the website and used to check the drive.
hard drive
1) Check that the jumber settings are properly configured if its an IDE HDD or check proper power cable is connected with it .ie molex in case of IDE HDD 2) Check that the IDE or Sata devices connected are disabled in the BIOS or not
an incorrectly inserted cable
The second drive can certainly be installed, but the computer will only recognize the boot block of the "C" drive. alternate bootloaders can be installed that take over the boot block, and will allow mutliple Operating Systems.
Check for BIOS updates, if it's an IDE drive make sure that all jumpers are in the correct order. Check cables (power, data) for cracks, damages.
There is nothing you need to do. All modern computers automatically determine how much RAM is installed.
BIOS needs to be updated to recognize the hard drive correctly
Yes, the motherboard does determine what hard drive can be installed. A computer is made for the hard drive to be compatible with whatever mother board is installed.
If you've installed more than 4 gigabytes of memory, you're going to have to upgrade to the 64-bit version of Windows XP to recognize it all. A 32-bit operating system is only able to recognize about 3.4 gigabytes of RAM. The computer, of course, will recognize that memory; and there are products on the market that will let you use the extra memory as a RAM drive. I'm still using the 32-bit version of XP, until I can afford Windows 7, and I have my swap file on the 4.5 GB RAM drive. I notice a substantial increase in speed with programs that do a lot of swapping to the hard drive.
The drive that the OS is installed on
Usually Windows is installed on the C:/ drive of your compuer. Press WINLOGO+E to see your hard drives
Usually it is installed on your HDD (Hard Disk Drive).