How does the computer recorgnize hard drive at all times?

My Comp, Compac Preesario SR1950NX does not recorgnide the Hard drive making it Freeze during the Boot up. How do I solve this problem

Hard Drive is not detectedPerform the following steps when the hard drive is not detected:
Step 1: Resetting BIOSFirst, reset the BIOS to make sure the BIOS settings are correct:
Turn on the computer and press F10 repeatedly to open the BIOS setup screen.
Press the F5 key to reset the default BIOS settings. Use the arrow keys to select Yes or OK and press Enter .
Press the F10 key to save settings and exit. Use the arrow keys to select Yes or OK and press Enter .
Turn off the computer.
Remove the power cord.
Press and hold the power button for five seconds.
Reconnect the power cord and turn on the computer.
If the startup problem is gone, you are done.
If the startup problem still exists, continue to the next section.
Step 2: Disconnecting and reconnecting hard drive cableUse the following steps to remove and reseat the hard drive cables:
WARNING:The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
CAUTION:This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
Remove the side panel by loosening the side panel screws and sliding the panel to the back of the computer.
Figure 5: Example of one type of side panel. Your PC may be different.
Find the power cable connected to the hard drive. Disconnect and reconnect the power cable.
IDE power and data cable location Serial ATA (SATA) power and data cable location
Find the IDE or SATA data cable connection to the hard drive. Disconnect and reconnect the IDE or SATA data cable from the hard drive.
Find the IDE or SATA data cable connection on the motherboard. Disconnect and reconnect the IDE or SATA data cable from the socket on the motherboard.
Replace the side panel.
Plug the power cable back into the computer.
Turn on the computer and wait to see if the startup problem still exists: 
If the problem has been resolved, you are finished.
If the problem still exists try the following, depending on whether or not the hard drive is IDE or SATA:
IDE : Make sure the jumper setting and cable connections are correct. For more information refer to Jumper Settings for the Installation of IDE Hard Disks and CD, CDRW, and DVD Drives
SATA : Try a different SATA connection on the motherboard.
If the startup problem still exists, replace the hard drive.
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