Computer Does Not Turn On

[Nate14150]

Hi,

I recently built a new computer, and everything was working perfectly fine. I shut the computer down properly and then the next day I tried to turn the computer back on and it did not turn on. I checked all the connections, and made sure all the connections were connected on the motherboard....Right now I am running out of ideas...please help!

Specs:
AMD Athlon FX-60
Gigabyte GA-K8N Pro-SLI Motherboard
2 gig DDR
512mb GeForce 7900 GTX
120 gig Maxtor

Thanks.

[Jiggy]

Welcome to PC Guide Nate14150.

What is the wattage of your power supply ?

1. Try changing the fuse in the plug.
2. Is there a rocker switch on the back of the psu and is it on ?
3. Try a different wall socket/outlet.

And as a last resort,

Try a barebones boot using only power supply, motherboard (out of the case on cardboard - and connect the power switch from front of case), one stick of memory/RAM, cpu+heatsink and graphic card,

Does it boot ?

If not then the problem is one of the above parts.

If it boots add back your parts one at a time rebooting after each part.

Does it boot ?

[Sylvander]

Fit an new CMOS battery...
And if that doesn't produce a fix...

Sylvander’s Diagnostic Flowcharts
Download a copy of my diagnostic flowcharts from here
www.erniek.eclipse.co.uk/downloads/sylvanderdiags.zip
and print them to leaf through.
Begin on the STARTUP chart.
Here's one possible route through them.
1. Does the PC appear "dead"?
Go to the SYSTEM chart.
2. Does the PSU fan run?
Assuming it doesn't, check the PSU voltages using the method shown below.
3. Assuming the voltages are incorrect [some attached component is pulling down the voltage on one or more rails], then disconnect all but essential components [and possibly include connecting the motherboard out of the case on a non-conducting surface].
4. Assuming this produces no fix, then go to the appropriate power supply chart [ATX POWER SUPPLY chart?] and look at the sites in the notes on the SYSTEM chart.
5. Check that the mains supply is ok; the leads and connections are ok; short the on-switch connections on the motherboard with a screwdriver, and if all of those fail...
Short the green & black wires on the power connector to the motherboard, and short the on-switch connections.

The notes on the SYSTEM chart give info on testing and shorting.

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TESTING ATX POWER VOLTAGES

See this http://www.ochardware.com/articles/psuvolt/psuvolt2.html

Black = ground
Red = +5 volts
White = -5 volts
Yellow = +12 volts
Blue = -12 volts
Orange = +3.3 volts (?)
Green = power on

Turn the power on. The fans should at least come on so that you know you have power.

Turn on the voltmeter and set it to measure DC voltage. Start with an IDE power connector that is not used. Place the black lead of the voltmeter in the hole of the connector that has a black wire (ground). Connect the red lead of the voltmeter first to the yellow hole and then to the red hole. The voltmeter should read +12v and +5v respectively.

The other voltages may usually be measured at the motherboard power connector by simply sliding the red multimeter test probe down the hole where each colour wire goes (with the black probe connected to any black wire as before). Really you only need to check the orange wire for 3.3 volts at this connector. If +12, +5, and +3.3 volts are all okay, then your power supply is probably fine.

Unfortunately, a low voltage measured in this way may mean a bad PSU or that some other component (motherboard, etc.) has a short and is pulling the voltage down. Therefore, the main value of measuring voltages is to eliminate the PSU as a source of the problem (if it has normal voltages).
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[Nate14150]

Thank you for ur help, I will try that.