Ya know Acer owns Gateway now,http://support.gateway.com/s//MOTHERBD/Shared/4006233R/4006233Rnv.shtml
A) Power Supply to motherboard cabling;http://www.ebay.com/itm/ECS-MCP61SM-AM-V-1-0A-SOCKET-AM2-AMD-MOTHERBOARD-uATX-/290606277901
Scroll down to the motherboard top view photo.
Product Views > Hardware Details
1) 24-pin ATX main power cable. (S - Main Power Connector)
This is a general example of a 24-pin ATX main power cable, and it's respective connector on the motherboard,http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24
[Note color of connectors does NOT matter ]
Note the Lock on the side of the main power cable's connector, and the matching Tab on the motherboard connector. When properly plugged in, the hooked end of the Lock will be over the Tab, on the motherboard connector.
In the photo of the motherboard shown on the Ebay link, this connector is on the Right side of the motherboard, next to the blue IDE (PATA) connector.
2) 4-pin ATX +12 Volt power cable; (F - Auxiliary 12V ATX Connector)
General example of a 4-pin ATX +12 Volt power cable, and it's respective connector on the motherboard,http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4
In the motherboard photo; Small square 4-socket hole connector, to the Bottom/Left corner of the Processor socket.
This power cable's connector also has a Lock, and the motherboard connector has a Tab.
That's all the power cables that go to the motherboard.
B) With 2 SATA headers (Connectors) on the motherboard, and one IDE (PATA) connector, it suggests to me that this motherboard is set up to use a SATA harddrive.
This is a general example of a SATA power cable,http://www.playtool.com/pages/psuconnectors/connectors.html#sata
Note that it has 15 contact pins, and between it, and the SATA data cable connector, it is the larger of the two.
There is a Lock tab on the connector that you depress, to install, or remove the cable.
You can use a SATA optical drive (CD/DVD drive), or an IDE (PATA) optical drive.
An IDE (PATA) optical drive uses a standard 4-pin Peripheral power cable,http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral
[ Misnomered as a 'Molex' power cable. Molex was the first to make the power cable's connector. Name stuck, kind of like calling an open-end wrench a Crescent wrench ]
A SATA data cable is used for the SATA harddrive. The connector end that goes to the Harddrive, is usually a 90 degree bent elbow.
The straight end plugs into the motherboard,
General example of a SATA data cable, and it's corresponding connector on the motherboard,http://en.wikipedia.org/wiki/File:SATA_ports.jpg
Note the L-shape in the inside of the SATA data cable's connector, and the L-shape on the motherboard connector. They line up.
The SATA power cable also has this L-shape.
In Hardware Details click on -> Q - SATA Connectors
The Bottom one, or one closest to the outside edge of the motherboard, is SATA1.
Although it isn't marked on the motherboard, or at least not visible in this photo, SATA 4 is. Look at the top where a SATA 4 connector would be.
The SATA harddrive should be plugged into the SATA1 header.
HOWEVER, the beauty of SATA is that it does NOT matter, which SATA header on the motherboard, you plug the SATA harddrive into.
BIOS will find it.
(Supposed to be SATA harddrive to SATA1, and a SATA optical drive to SATA2)
In the motherboard photo on Ebay, they are Orange in color, and under the blue IDE (PATA) connector.
C) Going from Hardware Details and the Ebay motherboard photo;
B - CPU Fan 1 Connector, is where the Processor fan plugs in.
In the motherboard photo, there are 7 cylindrical Electrolytic Capacitors in a row, to the left of the processor socket.
This connector is located immediately above the top capacitor, near the outside edge of the motherboard. (Brown in color)
E - Floppy Disk Connector, is above the white 24-pin ATX main power cable's connector, and the blue IDE (PATA) connector. It is Yellowish in color. (34 pins)
G - System Fan Connector, is white in color, has 3 contact pins, and is located under the white, square 4-pin ATX +12 Volt power cable connector. This is where the computer case fan plugs in.
I - PCI Express x16 Connector, is Orange in color, and below the processor socket. It has PCI Express silkscreened on the motherboard immediately below it.
This where a graphics card, and ONLY a graphics card, is installed.
J - PCI Express x1 Connector, is white in color, and immediately below the orange PCI Express x16 connector.
This is NOT used for a graphics card.
Whatever you can use in a PCI slot, except a graphics card, can be used in this slot; -> Provided it is a PCI Express x1 card.
(Ethernet Card, Sound Card, etc)
L - CD-in Connector is where the audio cable from the Main (Primary) optical drive goes to.
Ya got me on this one. I know it's located real close to the Realtek audio chipset, and I think that is to the left of the orange PCI Express x16 slot.
M - Front Audio Connector, is where the front audio (Sound) ports, of the Front Panel connect to.
Green in color, and located under the bottom white long PCI slot, and near the outside edge of the motherboard.
N - Clear CMOS Jumper is self explanatory. It is located under the finned Heatsink, (Looks like a meat tenderizer), of the Southbridge chip.
(Which is located under the Ram Memory slots)
O - USB Connectors are Yellow in color, and located under the finned Heatsink of the Southbridge chip, and towards the outside edge of the motherboard. (Or also located under the Ram Memory slots)
P - Front Panel Connector, is located at the Bottom/Right corner of the motherboard, close to the 'Buzzer'. (Buzzer is used for BIOS Beep Codes) PANEL1
4 pins on the Left side, 5 pins on the Right side.
The pins on the Left side are numbered EVEN.
The pins on the Right side are numbered ODD.
Starting on the Bottom of the Left side going Up;
Pins 2, 4, 6, 8, and 10.
Starting on the Bottom of the Right side going Up;
Pins 1, 3, 5, and 7
A) Pins 1 and 3 are for the HarDDrive activity LED. (Light)
Pin 1 is for the Positive ( + ) wire.
If the HDD LED is dim when the harddrive is active, switch the wires around.
B) Pins 5 and 7 are for a Reset switch. IF a Reset switch is used.
C) Pin 9 is Not Connected. Used by the factory.
D) Pins 2 and 4 are for the Power On LED. (Light)
Pin 2 is for the Positive ( + ) wire.
If the PWR LED is dim when the computer is on, switch the wires around.
E) Pins 6 and 8 are for the Power On switch.
More to follow.
For additional questions please post in a Comment.