Gateway Support > Gateway GM5664 Desktop PC > Downloads and Support Documents,https://support.gateway.com/us/en/product/default.aspx?tab=1&modelId=2734
Click on the Support Documents tab
(Drivers, BIOS, Applications, Patches, Support Documents, etc)
Click on the blue - 1015004R - Support Documents
Click on Product Views in the list.
Click on Inside View
Go back to the main page
Click on Components
Go to the heading - Motherboards
4006254R - ECS MCP61PM-GM
(AM2 processor socket, MicroATX form factor motherboard)
Gateway Support is of no further help to us. Product Views for the motherboard does not work.
ECS motherboards use a 10-pin Front Panel header, if memory serves.
One pin is not used. (Not there. Number 10 pin)https://www.ebay.com/itm/GATEWAY-GM5664-MCP61PM-GM-MOTHERBOARD-4GB-Ram-AMD-Athlon-II-Dual-Core-3-0GHz-/360423046239?pt=Motherboards&hash=item53eae33c5f
On the above link scroll the page down, until you come to the enlarged photo of the motherboard, with - Click an Image to Enlarge - under it.
Click on the photo view all the way to the right, on the top photos.
The view shows the 4 orange SATA headers on the motherboard.
(The whitish 24-pin ATX main power cable connector, is shown at the front, with the blue IDE 40-pin header behind it)
To the left of the orange SATA headers (4) is the Front Panel header.
Black rectangular connector with 2 rows of pins.
One row has 4 pins, the other row has 5 pins.
[ The plastic front of your computer is the Front Panel.
The area of pins on the motherboard, that the wires from the Front Panel go to, is the Front Panel header ]
Finding where number 1 pin is, is the problem.
Next to the number 1 pin, and silk-screened on the motherboard, is the number 1.
Looking at the rectangular connector (Front Panel header) you will note one pin is missing. This is where number 10 pin would be.
On the opposite side, and opposite end, is number 1 pin.
The pins are numbered Odd, 1, 3, 5, 7, and 9, on the same side.
The pins are numbered Even, 2, 4, 6, and 8, on the other side.
A) Pins 1 and 3 are for the HarDDrive activity LED light.
(HDD LED light)
Pin 1 is for the Positive ( + ) wire.
If the Harddrive activity LED light is dim when operating, 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. N/C. Reserved for the factory
D) Pins 2 and 4 are for the Power On LED light
Pin 2 is for the Positive ( + ) wire.
If the Power On LED light is dim when the computer is on, switch the wires around.
E) Pins 6 and 8 are for the Power On switch. (Located inside the plastic Power On button assembly. It is an ATX power on switch)https://www.fixya.com/support/t614458-hp_mcp61pm_hm_motherboard_diagram
As for the orange SATA headers on the motherboard. The SATA harddrive should plug into the lowest number of SATA header.
It may be labled SATA 0, or SATA 1.
The beauty of SATA however, is that you can plug the harddrive into anyone of those SATA headers. BIOS will find the device. (Harddrive)
If you need guidance in connecting any other cables, such as power cables, or optical drives, etc, post back in a Comment.