Is my motherboard fried?

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Omegti

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Oct 11, 2013
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I recently bought a new motherboard for my PC and I am afraid I may have shorted it out. After two days of working fine it randomly shut down while in a game. When I tried to turn the system back on I realized that it was unresponsive and that there were no LEDs lit up on the motherboard.
I figured my PSU had died since it was a fairly old one so I went to my local Fry's and bought a new one. Upon installation of the new PSU I was still having the same problems, absolutely no power showing at the MoBo. I have tested the PSU on another system and can confirm it is working and it is definitely more than enough wattage.
I have torn the system down to literally just the PSU, MoBo, and CPU and there is no power at the MoBo. I did discover at this time, though, that when I reseat the 24 pin that the LEDs will light up and 50% of the time the power button will bring the system to life for a split second, the other 50% is unresponsive. Any advice?
 
Solution
Dogsnake
It sounds like the 24 pin connector is defective in some way. If you can remove the MB or if you can see the back side of the board around the connector leave it installed. Inspect the solder and see if you can detect any hairline cracks. Use a magnifying glass it will help. You can also gently try to wiggle the socket on the board with your hand. Just a slight pressure to see if you can detect any shifting of the pins on the backside. A bad solder point may also look grey or dull unlike the uniform shiny of the rest of the boards' solder. You can also try with the system still assembled to gently press and wiggle the 24 pin plug in the socket and see if the MB lights up. GL
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Dogsnake

Dogsnake

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Oct 20, 2006
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It sounds like the 24 pin connector is defective in some way. If you can remove the MB or if you can see the back side of the board around the connector leave it installed. Inspect the solder and see if you can detect any hairline cracks. Use a magnifying glass it will help. You can also gently try to wiggle the socket on the board with your hand. Just a slight pressure to see if you can detect any shifting of the pins on the backside. A bad solder point may also look grey or dull unlike the uniform shiny of the rest of the boards' solder. You can also try with the system still assembled to gently press and wiggle the 24 pin plug in the socket and see if the MB lights up. GL
 
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Essdub8

Essdub8

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Feb 13, 2012
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^+1

I've had this exact problem before; defective solder joint on the 24-pin connector. A magnifying glass might help distinguish the bad joint - hairline cracks can affect proper connections also.

Also take a glance at the PSU cable for the 24-pin connection; peek into each pin hole and ensure that the crimp connector isn't pushed back into the plastic shroud. Sometimes the pins from the connector will push those back.
 
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