Unplugged wires on the motherboard

Nope

Just basic diagnostic tools

First thing to check IS the Power Supply.
Then the diagnosis goes on.

So far all you have told me is an assumption. You ASSUME the Power Supply is OK.

Don't.

1) If ALL of the LED's were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can draw from 51 to 125 Watts of power.
Just depends on what Processor it is,

By having JUST the CPU on the motherboard, and the fan on the Power Supply doesn't work; you have just PROVED that.

Do you have a multimeter?
An economical one can be purchased for as little as $5 to $12.
Available in a multitude of stores.

There are 3 main voltages to check. Check while PSU is plugged into mobo. (Power Supply Unit; MOtherBOard)

A) 3.3 Volts
B) 5 Volts
C) 12 Volts
All are DC Voltage. (Dotted line over a solid line for Multimeter)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

The Orange wires are 3.3 Volts
The Red wires are 5 Volts
The Yellow wires are 12 Volts. All are DC Voltage. (DCV)

The 24-pin ATX main power cable is left plugged into the mobo.
The BACK of the power cable's connector; is where the wires go in.

Power Supply unplugged from power; a straightened out paperclip is inserted down into the socket hole with an Orange wire in it.
The paperclip slides down alongside the insulation of the Orange wire, and touches a metal female terminal.

Every wire going into the 24-pin ATX main power cable's connector, ends in a Molex female metal terminal,

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

The brass tip openings can be seen, in the Playtool link's middle photo. (Tip openings; Front. Paperclip touches Back)
MUST touch that metal terminal.

Another paperclip is slid down into ANY socket hole, with a Black wires in it.
ALL Black wires are Ground wires.

Making sure the paperclip jumper wires, are of the correct length by cutting; there is no way they will accidentally touch each other.

Positive (Red) probe lead of multimeter to Orange wire paperclip;
Negative (Black) probe lead of multimeter to Black wire paperclip.
You should read 3.3 Volts (DC)

Do the same for the Red - 5 Volt wire. Red wire and Black wire.
12 Volt - Yellow wire and Black wire.

Post back in a Comment.
Regards,
joecoolvette

On another note;
Did you just recently mount the mobo to the computer case?
Did you use metal Standoff's, or plastic Spacers?
(Standoff - Hex shaped brass piece, usually 1/2 inch tall; and with a threaded hole on one end, and a threaded shaft on the other)

The Support Plate can be a separate metal plate; or is an integral part of the computer case.

IF, there is a Standoff on the Support Plate, that is NOT lined up to a motherboard mounting hole, it can touch exposed solder joints on the bottom of the motherboard.

This will short circuit the motherboard. MOST of the time when the 'offending' Standoff is removed; everything is OK.

This model (as well as many other Dell desktops) has a DUAL SPEED CPU fan. If the motherboard detects that the CPU temp is running hot it will increase the speed of the CPU fan to lower the temp of the CPU. You should do a Google search for the correct CPU fan and purchase it and install it back into your computer.

Turn the computer off.
Disconnect the power-cord.
Open the side-panel, and take a look.
There should be one fan on top of the CPU (Central Processing Unit) -- the "CPU fan".
There should be one more fan,
probably screwed to the inside of the back panel.
Check that the 3 wires leading from the fan are connected somewhere on the motherboard, i.e., not hanging loosely.
Two of the wires bring electricity to the fan,
and the third wire reports the speed of the fan.
By hand, try to "spin" the fan-blades -- if it does not spin freely, your fan has "seized", and needs to be replaced, because the "speed" of the fan has been reported as 'zero'.

did you call gateway they can help you

According to the manual your Motherboard supports two case fans. You can use either of these pins setups. For your motherboard you have three pins with the third pin ( CLOSEST TO THE CPU) controlling the rotation of the fan. For your two pin fan put the black ( ground ) wire of the two wires on the pin FARTHEST from the CPU.
Note: Manual says the fans should be a max of 350 Ma.

For more information see your manual or look here for a on-line manual.

http://www.manualnguide.com/dl/9354/

Good Luck

1. Go to: http://download.aopen.com.tw/Default.aspx
2. In the drop-down menu labeled "select a product", select "Motherboards".
3. In the drop-down menu labeled "select a Model", select "AX4SPE-N".
4. In the drop-down menu labeled "Category", select "Manual".
5. Download the first item on the list: "English Manual for AX4SPE-N
6. On page 22 of this manual, there is a connection diagram for the front panel connections, which you refer to in your question.

Power On switch (Button)? Restart switch? Speakers?Wires came loose from the motherboard?
Should like you to see if you can trace the wires back to the front panel, (Where the Power On button is located
Granted, this may be a little tough in some instances. If you can, ease the front panel loose, and you'll get a better view.

There are usually four to six tabs, coming from the front panel. Two or three on each side. Usually one at the top, one in the middle, and one at the bottom. (On the three tabs per side model) These plastic tabs are eased towards the inside direction of the computer. You will observe that they have a 'tang' on them. You just ease the tab to the inside, until this tang clears the hole, then ease the front panel forward a little. Once you get one tab started, then go to the next tab up, or down. Depends on if you start at the top, or bottom.

This way you can see if this Black and White wire goes to the Power On switch, the Reset switch, (IF used), one of the speaker wires, or one of the LED lamps in the front panel. (Power On, or Harddrive activity lamp)

I also need the model name and model number.
Example: T1090

I have to find an illustration of the motherboard (Try), and be able to tell you, what pins on the motherboard those wires go to.

Now, up front, finding the motherboard specifications for an eMachine computer, is a little tough. Also, there were three different motherboard manufacturers. Makes it a lot of fun.(?)

However, not to despair. I'm pretty decent at finding this info. I have worked on a lot of eMachines, and have a few around my shop right now. Maybe I (we'll) get lucky.

Hi the 3 wire connector you have mentioned is for the FAN do not forget to connect it - you can find a 3 pin connector either white / brown in color on the motherboard - plug the 3 pin connector into this - it can be connected in only one direction .

You have 500mA on usb port. If you cause a short on usb connectors, this can damage the motherboard.
Disconnect usb port on motherboard (work with power unplugged ), remove all ide and floppy cable,eventually remove and put back in place bios battery and Ram.
Restart Motherboard only with 1 module Ram (bios battery back in place), CPU and Fan (ensure cpu and fan are well in place), do not plug anything else than switch on button.
If it still does not work there is a good chance you blew the Motherboard.

Regards

Ensure that you got the cpu fan connected to the correct place, the board has 2 one for the cpu fan andt the other for a system controlled case fan.

If that dont work check to see you got the power supply connected to the board propperly, there is a seperate 4 pin connector using 2 yellow and 2 black wires ensure it is correct.

Check your power supply

unplug the power supply and bridge the green wire with the black one next to it to see if it comes on. OR JUST CHANGE THE POWER SUPPLY TO SEE IF IT WORKS.

YOUR PROBLEM IS A POWER PROBLEM EIGHTER FROM A BAD CONNECTION OR A WRONG HOOK UP AND IF NOT THAT A BAD POWER SUPPLY