A computer repair customer of mine brought to me a Hewlett Packard Laptop model 15AC121DX. I am going to describe what you need to do to remove the hard drive in this notebook computer. First you will need a philips style screw driver.
Then you will want to remove that laptop battery from this computer system. There are two releases, one on each side of this battery that you will need to press. Once that laptop battery is removed, there are two screws underneath this battery that you will need to remove.
You will want to remove those two screws plus another ten screws. Two of the remaining ten screws are hidden under rubber feet on each side of this laptop towards the rear. Once you have all twelve screws removed you can then take this bottom cover off by just pulling the cover up towards you while the laptop is laying face down.
That laptop hard drive is located towards the left front. There are two small screws holding this hard drive in place. You will need to remove those two screws in order to remove that hard drive.
Now you can pull that Hewlett Packard laptop hard drive out. The hard drive is connected to an active current direct current power adapter that connects to the motherboard. You can just pull this power adapter cable off.
It is attached near the serial AT attachment cable and power connectors on that hard drive. There is one metal bracket attached to one side of this laptop computer system. If you are replacing this hard drive you will need to transfer this metal bracket to the new hard drive.
There are two small screws that hold this metal bracket in place. You will want to make sure that this metal bracket is attached to the hard drive on the correct side so that the serial AT attachment cable and power connectors face towards you when attaching the hard drive adapter cable again. You will want to remember to screw down the hard drive with those two small screws, so that it does not move around inside that laptop computer case.
You can then place the back cover back on. You will need to remember to tighten the two screws under that Hewlett Packard laptop battery. Then you can insert the laptop battery back in its compartment.
You will want to slide the optical drive back in its permanent slot. Now you just need to tighten the ten remaining screws. Congratulations, you have successfully replaced the hard drive on a Hewlett Packard laptop model 15AC121DX.