Tried new power supply but didn't help. (Who knows - maybe I didn't install correctly.) I first thought it was the power switch on front of machine. Was wondering if some easy test for power switch?
Tips from me:
1.If your power supply isn't coming on, I advise you to check the 20/24-pin motherboard power cable,
connector, and be sure it's down in tight. Make sure that lock tab of the power cable connector, snaps over the motherboard connector lug. Make sure that connector is in all the way.
2.Be sure the wires that come from the Power On switch, and go to the motherboard, are connected, and down all the way. The connector, or individual connectors, need to be down on those motherboard pins all the way. (The area on the motherboard where they connect, is called the Front Panel header. A connector on a motherboard is called a Header)
Also make sure both wires from the Power On switch, (Button), are connected to the motherboard, if the wires have individual connectors.
Now, how to test to see if the Power On switch is bad.
The 20/24-pin ATX motherboard power cable connector comes in three styles.
A.20-pin connector. Has two rows of 10 socket holes
B.24-pin connector. Has two rows of 12 socket holes
C.20-pin and a 4-pin connector.
NO matter what style it is, it has a Green wire going to that connector. The Green wire is the
Soft Power On wire.
With the motherboard power connector plugged into the motherboard, and the computer plugged into the surge protector, you need to jump that Soft Power On wire, to a Ground wire.
View these photos of a 20-pin ATX Main power cable. (Motherboard power cable, Main power cable.
Look at the photo all the way to the right. (You can save this page, and bring it up in a new window)
This shows that Green wire. Fourth one from the left.
Next to it is a Black wire. Fifth one from the left.
ANY Black wire is a Ground wire.
You need to make a jumper wire. This wire should have insulation on it. It should be as thick as those power cable wires. It should be about 3 inches long. You need to strip off 3/4ths of a inch of insulation, off of EACH end. Twist the exposed wires. Make a tight wrap. Bend this wire into a U-shape.
At this point you may want to don a protective rubber glove. Tightly fitting dishwashing glove, or perhaps a surgical style one. Reasoning is, that there will be a spark. You may feel more safe this way. I don't use one, but I'm an old tech, and maybe not too Tightly Wrapped! lol! (I also was a journeyman lineman, so this spark doesn't bother me!)
With the ATX motherboard power cable plugged into the motherboard, you are looking at the back of the connector. The wires go down into a socket. At the end of every wire is a metal terminal end.
It's pretty far down in there. One end of your jumper wire, goes down deep into the Green wire socket. It needs to touch that metal terminal end.
The other end of your jumper wire, needs to touch a Ground wire terminal end. ANY Black wire is a Ground wire. Just stick the end down into a socket with a Ground wire. Hold it there for about 1 to 2 seconds, bring the wire back out. You just want to make a Momentary Contact.
Your power supply should start.
If so, you have a bad Power On switch. If not, your problem is the power supply, or the motherboard.
Apr 19, 2009 |
E-Machines eMachines Desktop PC