If this problem is in direct relation to a Compaq Presario SR5501F desktop computer;
HP Support > Compaq Presario SR5501F > Motherboard Specifications,
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01237538&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&lang=en&product=3740354The motherboard is made by ECS for HP/Compaq
ECS model number is MCP61PM-HM
HP/Compaq's name is Iris 8.
There is no wiring diagram per se to give you.
I'll have to detail the wiring connections step by step for you.
This may be a little lengthy.
On the link above you are looking at a photo of your motherboard.
There is also an illustration available.
I would like you to copy, and save them both.
Using this method you will be able to enlarge them for further clarity, of the connections to the motherboard.
Right-click on the motherboard photo. Left-click on Save Image As, in the list.
In the Save Image window that comes up, you will see the heading File name:
To the right of File name: will be c01237541.
Unless you want to search for c01237541 you may wish to do this:
Put your mouse cursor after the 1 in c01237541.
Left-click twice.
Make one space with your spacebar.
Type Compaq Presario SR5501F Mobo photo.
(Mobo stands for MOtherBOard)
You want this photo to go to your My Pictures folder.
(Windows XP. Different for Vista)
At the top of the Save Image window is the heading - Save in:
In the box to the right you should see - My Pictures
If you do Not you will have to change the destination.
Left-click on the blue down arrow to the right of the box.
In the list, left-click on - My Documents, then left-click on - My Pictures.
Now go to the bottom right of the Save Image window, and left-click on Save.
In the link, scrolling down you will see the heading - Motherboard layout
Left-click on the + sign next to Motherboard layout.
Copy and save it as you did for the motherboard photo.
In the File name: box type - Compaq Presario SR5501F Mobo Illustration.
Now all you have to do is go to your My Pictures folder (Start>My Pictures), and double-click on the photo, or illustration.
Left-click on the Zoom In icon at the bottom of the window to enlarge.
(+ sign in a magnifying glass icon)
Wiring Connections to the Motherboard:
A) Front Panel header: (Panel 1)
The Front Panel, is the plastic front of your computer where the Power On button, HarDDrive LED light, and Power On LED light is located.
The Front Panel header is the connections, or pins, on the motherboard, where the cables (Wires) go to from the Front Panel.
On the motherboard illustration it is marked as Panel 1.
(Down in the bottom right corner)
On your motherboard, Panel 1 (Front Panel header) is Black in color.
As you can see it is a rectangular block, and is placed vertically.
Has 2 columns of pins.
5 in the left column, 4 in the right column.
The Left column is numbered Odd.
Starting at the Top going down, Pins 1, 3, 5, 7, and 9
The Right column is numbered Evenly.
Starting at the top going down, Pins 2, 4, 6, and 8.
Pins 1 and 3 are for the HarDDrive LED light.
(HDD activity LED)
Pin 1 is for the Positive connection ( + )
Pins 5 and 7 are for the Reset switch.
Pin 7 is for the Positive connection. ( + )
Pin 9 is reserved, and may not be used.
Pins 2 and 4 are for the Message LED light. (LED = Light Emitting Diode)
Power On LED light.
Pins 6 and 8 are for the Power On switch.
There is No Pin 10.
If the cables (Wires) are not marked coming from the Front Panel, you will have to remove the Front Panel, and trace where they go.
You will be able to physically see where wires go to the Power On switch, Power On LED light, HarDDrive activity LED light, and so on.
B) 24-pin ATX main power cable:
Only plugs in one direction. Plugs next to the blue IDE connector on the motherboard. (To the right of the ram memory slots)
C) 4-pin ATX +12 Volt power cable.
Looks like this,
http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4Plugs into the whitish square 4 socket hole connector on the motherboard, next to the Processor socket.
(On the motherboard illustration this connector is labeled - ATX12V1
D) Processor Fan:
Connects to the 3-pin CPU header on the motherboard. Right above the ram memory slots.
E) Harddrive:
You have a SATA harddrive. (500GB in size)
Connects to the SATA 1 header on the motherboard.
The SATA 1 header on the motherboard is Black in color.
The data interface cable has 7 pins.
Looks similar to this, (May not have a 90 degree elbow though),
http://en.wikipedia.org/wiki/File:SATA_Data_Cable.jpgThe SATA power cable has 15 pins.
Looks like this,
http://www.playtool.com/pages/psuconnectors/connectors.html#sataNOTE*
If your SATA harddrive has a place for a SATA power cable, AND a 4-pin Peripheral power cable, DO NOT plug both power cables in!!
This will lead to damage of the SATA harddrive!
The standard 4-pin Peripheral power cable looks like this,
http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral(The standard 4-pin Peripheral power cable connector, has had a misnomer for years as a Molex connector.
Molex was the first design implemented when this style of connector came out.
The name stuck.
It is the same as calling an adjustable open-end wrench a Crescent wrench)
F) Optical drives:
If you have a DVD burner drive it plugs into the SATA header 2.
(Uses the same style of SATA data interface cable, as the SATA harddrive)
If any of your optical drives are IDE, they plug into the blue IDE header, next to the ram memory slots.
This is what a flat ribbon IDE data interface cable looks like,
http://en.wikipedia.org/wiki/Integrated_Drive_Electronics(You can click on the photo to enlarge. You can enlarge twice)
G) The Floppy Disk drive, (If your computer came with one), plugs into the FDD connector shown on the motherboard illustration.
(Black in color, right above the 24-pin ATX main power cable connector)
Do you need information on the USB connections?
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