[SOLVED] Problem with connecting psu to motherboard

[Mr_Fast_FeeD]

This is now my second motherboard of the same type, and the same problem has happened. The psu will run fine on its own with a tester, but once i plug it into the motherboard, it will not turn on. Also, the cpu socket doesn't look like it has any bent pins. I'm wondering if this is a problem with the connections themselves or if I just got two separate motherboards broken in shipping.

 

[lvt]

Does the power button on your case still works well?

Did you try the "PWR pins shorting" method?

 

[Mr_Fast_FeeD]

Does the power button on your case still works well?

Did you try the "PWR pins shorting" method?

I've tried shorting the pins, but I don't have the power button connected currently.

 

[lvt]

I've tried shorting the pins, but I don't have the power button connected currently.

You should remove everything from the motherboard and start from scratch with the minimum of parts, for example just RAM and CPU then try again.

Sometime a dirty RAM or CPU connector can cause a problem.

 

[Mr_Fast_FeeD]

You should remove everything from the motherboard and start from scratch with the minimum of parts, for example just RAM and CPU then try again.

Sometime a dirty RAM or CPU connector can cause a problem.

Tried that, it still won't turn on with just the 24-pin and the motherboard connected

 

[lvt]

Tried that, it still won't turn on with just the 24-pin and the motherboard connected

Can you start the PSU using a paperclip like this?

 

[Mr_Fast_FeeD]

Can you start the PSU using a paperclip like this?

Yes

 

[Karadjgne]

Then the problem most likely is the psu. Voltage is only part of the equation and that's what that tester looks for.

All it takes is minute contact to show voltage. If you think about your house mains panel, it's supplied by very large cables, to handle the load, but only takes the needle on a test probe to show voltage.

When solder joints break, components fail, traces crack, it only takes the smallest contact to show the psu as being good, but as soon as a real load is applied, that tiny contact cannot flow the current, and Power = 0.

That issue can be anywhere. Could be internal on buss connections or solder joint, could be external in the wires or connectors, but I'm betting the psu as is is the issue. I'd replace the whole thing, psu and wiring, or at least test with a known working psu and wires.

Power fluctuation is the issue, so start with what supplies the power, then worry about what comes after.

 

[dwd999]

What model motherboard is this? Is it designed to work with only the 24 pin power connected? Some motherboards have additional 8 pin or 4 pin power connectors and won't boot unless those are connected. Is the cpu cooler connected, since some boards won't boot unless something is connected to the cpu fan connector.

Let's start at the beginning: what is the make and model of each of the components, are they new, used or refurbished, where did you get them from, all the details.

 

[Mr_Fast_FeeD]

Alright I figured out the problem, turns out it was a bent pin. Apologies!