I have an Antec TP-2550 power supply in my computer and currently my computer will not start. The green LED on the motherboard is lit up. I've recycled the power switch numerous times, removed the CMOS battery-held the power swith for 30 secs-nothing, removed all cards, installed them one at a time while cycling power each time-nothing. Checked all connections-good. Checked RAM-good. I'm LOST! I did confirm the electrical outlet is good also. Computer was working fine until yesterday. I did lose my LED display where the LED and power/reset switch are located.
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For 120 volt operation use
black for the hot, White for the natural, Green for earth ground.
For 240 volt operation use;
Black and White for the 240 volt and Green for earth ground.
Black is generally designated as the "Hot" or "positive" .
You must make sure the switch on the power supply is set for the voltage you are using. ie: 120/240
Thoughts: There are two connections from the power supply to the motherboard. One has 24 pins and the other has 4. Make sure they both are correctly (and fully) inserted. Try powering the computer on with all the devices disconnected (hard drive, CD, etc).
orange - +3.3
white - -5v
green - ps-on(+5v)
gray- power good(+5v)
purple- stand by (+5v)
disconnect smps from motherboard give the power to smps and short green and black wires and measure the above voltages
1. Check that the cpu fan is properly connected to the correct port marked CPU FAN.
2. Make sure the power cables are connected correctly to the motherboard.
3. Test the button switch with a multi-tester to make sure that it tests good.
4. Make sure the power switch is connected to the correct pins on the motherboard.
5. With the computer off pop the cr2032 battery out and pop it back in after a few minutes.
6. Test the power supply with either another motherboard or a power supply tester.
7. Test the motherboard with another power supply.
8. If all else fails replace the motherboard I have had a bad one from time to time even out of the box, and if you have a spare cpu you may want to test with that also. Cpu's hardly ever go bad I think I have had two go bad ever, not counting power surges and storm damage.
if when you try to turn on youre computer the coolers are spinning for a short while as the computer would start and than they turn off, than it has a problem with the AC/DC diode transformer. There ast=re 4 to 8 diodes in there in parralel with asa many capacitors witch are transforming alternative curent from the secundary winding in direct current. In this case replace the diodes with ones with the same technical specs. If the computer won't even try to start check for brohen resistors ( or safety fuses.. the same thing because any resistor is a safety fuse ) or broken capacitors ) they are broken if they are blackened. The resistors can be checked with an Ohmmeter ( if theyr impedance is null or infinite they are broken ) the capacitors can be checked in the same way with a multimeeter ( if theyr capacity is 0 microFarads they are broken, or you could check them by applying to every one of them a closed circuit with a low voltage light bulb as the ones in small flash lights and a AA or AAA battery... if the light bulb turns on then the capacitor is broken). if none of these are the problems than check the PowerGood Signal or PGS. It is carryed usualy on a grey or green wire from the power supply to the motherboard trought the ATX connector. You can find the color coding for the wires on the case of the power supply (RED-+5v YELLOW +12v Orange +3.3v etc.). If the PGS wire is severed the computer will fail to start. Replace the PGS wire to solve the problem. Eventually check for any loose wires in the power supply because they can lead to shorts or to non functionality. Be shure to check first the capacitors that modulate the direct courrent in the power supply. if those are broken the power supply will fail to function. The destruction of those capacitors can be caused by using innapropriate voltage instead of 220v 110v or the other way. This thing is controled by a switch on the back of the power supplu located usually under the power cord insertion slot.