Computer Power Supply & Motherboard Replacing

If your computer is acting up, chances are it may need a new power supply or motherboard.

In this article you’ll learn how to replace these parts.

Most computer cases come with a power supply; however, in some cases it is not included, it may be necessary to purchase one separately.

The power supply is a metal box and it supplies low voltage power to the various circuits inside the computer. It also has a fan inside to keep it cool.

The power supply has 4 to 7 connectors that will plug into the mother board and disk drives.

Orient the power supply with its fan so that the fan faces the back of the system case, and place into position.

Fasten it to the case with screws using a non-magnetic screwdriver only!

You are now ready to install the motherboard, also known as a main or system board.

There are 2 types, depending on what system you want to build.

The AT   socket  7 and the ATX module slot 1 each using their own power supply and case.

If you are upgrading your present system you’ll want to make a diagram of all connections before you remove them.

Carefully remove each expansion card from it’s slot, it will be secured by a single screw.

It’s OK to seesaw the card end-to-end slightly to loosen it, but don’t bend the card sideways.

Set the cards on the power supply with paper separating them.

Leave all cables connected.

After making your diagram remove all cables to the motherboard.

Locate and remove all mounting screws.

Now you are ready to install the new motherboard.

Using the hardware that came with your computer case you will mount the motherboard.

Orient the board so that the power supply  sockets  are facing the back right corner.

Mount brass and plastic standoffs in the case to match the holes in the board.

Secure the motherboard with screws using non-magnetic screwdrivers only!

For an AT style board connect the two power supply cables to the motherboard.

The black wires go in the center next to each other.

Tilt the connectors away from the power supply and align the hooks on the connectors with the space on the  sockets  between the metal prongs and the back of the  sockets .

Tilt connectors toward the power supply until they are vertical and slide them down over the prongs.

For an ATX style you will only have 1 connector.

Your new motherboard comes with disk drive cables; these are the flat Grey cables with a dotted colored edge, usually red. There are cables for a hard disk drive and a floppy disk drive.

The hard disk drive cable is wider than the floppy disk drive cable.

If you are replacing your current motherboard use your original cables.

If you look closely at your motherboard you will notice that all connectors are marked in white lettering.

Insert the wider hard drive cable in to the PRIMARY IDE  socket , the colored edge will go near pin # 1.

Insert the floppy drive cable into the floppy disk drive  socket , the colored edge will also go near pin # 1.

There are several wires coming from the computer case, these wires lead to the indicator lights and the speaker.

If you are using an ATX case power supply and motherboard you will have an additional wire that’s marked P S for power switch. This wire will plug directly in to the ATX motherboard.

If you’re working with an AT style, plug the lead for the power supply directly into the power switch in the computer case.

The remaining wires are marked on their connectors as follows:







These wires connect to their associated  sockets  on your motherboard.

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