How to remove hard drive from acer m1201 desktop computer

Shut down the pc.
Disconnect all cables from the back panel of pc.

You would notice 2 thumbscrews at the back of pc to open its left side (u face the pc front).
Use a screw-driver if needed.
Slide the left panel backwards to open it.

Inside, locate the hard drive.
Its rectangular in shape, just below the dvd-drive.

Disconnect the 2 cables going to it (multicolored bunch of cables is for power supply, another single thin flat cable connects it to motherboard).

Remove the screws or undo the clips that are holding the hard drive in place.
Pull it backwards, it would come out.

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The first thing to know before attempting to work on the inside of a computer is that a simple static spark (like when you rub your feet on a carpeted floor and zap your friend.... is around 30,000 volts.....believe it or not it's true and that spark can destroy your computers graphics card, sound card, memory chips, and processor)...buy a grounding cable (Radio Shack - attaches to your wrist and clips to the compute case)...or at the very least...Take your shoes and socks off and make sure you check by touching a friend or family member to make sure your'e not holding a charge.
Now you are read to open the case on your computer...There is usually a screw on the back of the computer that has to be removed and the case slides to the back or from the bottom to the top to remove it....You will need to remove the screws that hold the drive into the holder....Once removed you will need to locate the hard drive and remove the two cables attached to it...One is the power cable (the smaller one) and the other is the cable that attaches to the mother board. ....Replace the old hard drive with the new one and connect the cables....Put it all back together and turn on the computer....It should recognize the new drive and you're off and running....You will need to re-install your operating system and take it from there.