Disconnect the power cable at the back of the computer. Don’t need to do the others.
Open the case, using the latch on the right rear corner (if lying flat). The blue latch will slide to your left, clicking as it reaches the fully open position. Use the handy metal extrusion next to it to slide the cover of the machine toward the back of the machine, then lift it off.
With the front of the machine facing you, gently pull up the three plastic locking tabs indicated in the first picture, below left, to disconnect the machine’s face as shown.
Now slide the blue latch in the drive tray assembly toward the rear of the machine, until the open padlock symbol is visible. If the latch is in the locked position, the closed padlock symbol will be visible. Once the latch is open, lift that side of the drive tray assembly, then disengage the tabs at the other end (which will act like hinges for lifting the assembly), and lay the assembly back. There is no need to disconnect the wires, but don’t yank on them.
Note the speaker wire, which should be visible in the small space between the front of the machine and the power supply (large rectangular silver box inside the machine).
With the front of the machine to your left, locate the jack to plug the speaker back into. Note that the plug for the speaker wire has small projections on one side. Those will slide into the open notch in the side of the jack.
The speaker plug will slide vertically into the jack for it, usually with the projections and their receiving notch facing away from the power supply. Don’t force it. If it won’t go, reposition the plug and try again. Smaller fingers will have an easier time with this, or a pair of tweezers/needle-nose pliers can be used (with caution not to crush the plug or wires). Only light pressure should be needed to get the plug firmly seated.
Time to close the case back up. First, flip the drive tray assembly back right side up, and slip the tabs back into place. They will again act like hinges as you lay the assembly back into place. Be careful not to pinch the wires that are near the latch. You may have to reposition them to get the assembly to lay flat. Once it is flat, slide the blue latch back to the locked position. If the assembly isn’t properly positioned, the latch will not hold it in place, and may not slide at all.
Next, reattach the face of the machine. Start by lining up the 3 black tabs with the holes they go into, then lever the face back into position. The locking tabs you originally lifted to remove the face will click back into position. There should be very little gap between the plastic face plate and the frame of the machine, as shown in the second picture. If something looks uneven or crooked, the face is improperly positioned.
Last, grab the cover/lid. Note that there are tabs along the inside edge of both sides that must be lined up with the notches in the frame, in order to lay the cover back onto the frame. Once the cover is flat on the frame slide it toward the face until it clicks & locks.
Plug the machine back in and power it up. Sound should now function normally.
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