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First reset the CMOS. Check your motherboard specs for how to do this or remove the small round silver battery from the motherboard; wait 30 seconds and reinstall it. (It is a good idea to replace with a new battery.) This will reset the CMOS. Then reboot to see if HDD is detected. If not, go into the BIOS setup (repeatedly hit F10 at HP logo screen) and check to see if your hard drive is listed. You may have to set it to "on". If it is listed in BIOS, but not detected another drive (a bad one) could prevent it from being detected. If you have any removable or external drives attached to your computer, disconnect them. Reboot your computer to see if your HDD is detected. If not, open your case and disconnect the data cable from all drives except your primary hard drive. This includes the floppy, optical, zip, backup, or secondary hard drive(s). If your HDD is detected, reconnect each drives data cable one at a time rebooting between each. If after reconnecting a drive and rebooting, your HDD is not detected the last drive is a bad drive and preventing your HDD detection. I have found that sometimes a bad drive that is connected will let the HDD be detected then on later boots the HDD will not be detected. Also it is possible that your BIOS is corrupted. Let's hope not. Another possibility is a bad motherboard. I hope this helps you.
Verify that the hard disk is connected on both data and power cables and is receiving power (it hums at startup); also that the proper EIDE or SATA slot on the motherboard is used, and properly jumpered (e.g. a SATA 2 disk on a SATA 1 configured port is likely to malfunction).
Check that the BIOS is configured to autodetect the hard disk type, and is using the appropriate adapter (EIDE or SATA port), without RAID options or such.
In a pinch, try also ignoring the motherboard labels (e.g., plug the hard disk on the fourth SATA port instead of the first -- the mobo numbering is not always the "logical" one, even if it usually should be.
go into the bios during rebooting stage and check whether you have automatic detection of drives. If set to disabled or manual change to automatic. You may have a problem with the motherboard interface to hard-drive.
Usually when your BIO's doesn't detect the hard drives is usually a good indicator that the hard drive has failed. In rare instants it is the motherboard. In the boot sequence it will only show the hard drives it sees if it doesn't see any then none will be shown. I would start with a new hard drive.
What Operating System are you using now? Try looking your pendrive in the Disk Management.
Go to Start, Control Panel-> Performance and Maintenance->Administrative Tools. Double click Computer Management icon -> Expand Storage, click Disk Management. Find on the right corner bottom if the removable disk is detected. If it does, Click Make Partition as Active / Reformat.
*Drop me a comment if it is detected or not. I'll be waiting. I will assist you.
If holding the cable allows it to detect the drive I would have to say you are getting a bad connection.
Try plugging into another sata connection on the motherboard, if that does not work try another cable, if that does not work it only leaves the hard drive. If it is still under warranty you can try to return it to the manufacturer for repair but be sure to back up all your data because there is an excellent chance they will just send you back a refurbished drive.
What type of hard drive do you have? Check that it has the proper power cords, and that it's properly detected in the BIOS. Some SATA Hard drives have both, a SATA power and a traditional 4 pin power plug, and you should only use one of them at a time.
Sounds to me like the motherboard has not properly detected this hard drive yet, or it's a RAID volume and windows doesn't have the driver to install it yet.
Post back with more detailed specs and I can help you further.