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Motherboard or Power Supply


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#1 sausage

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Posted 28 July 2011 - 06:29 PM

So I bought parts for a new computer, plugged everything in, hit the power switch and... Nothing. No beeps, no lights, no fans, nothing. We checked and 25-tuple checked every power wire in the box and they were all connected. How do I test if it's the PSU or Motherboard? (There was a very high pitched hum in the power supply when it was recieving power)

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#2 cryptodan

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Posted 28 July 2011 - 06:40 PM

Do you have a Uninterruptable Power Supply like a Surge Protector connected to the wall and the power supply from the computer connects to the UPS?

That loud hum is a sign of electrical noise.

Can you test the PSU in another computer and see if it powers that one on with nossies, and if the hum is there?

What brand and model number is your PSU, and also the rest of your computer specs.

CPU, RAM, Memory, HDD, and Video Card are sufficient enough.

#3 sausage

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Posted 28 July 2011 - 07:14 PM

Tested it in my friend's old computer and no luck, there was a hum. (The power switch was not plugged in and we tested several different spots on his mobo for the switch cable, however we may have missed the right one)

I used both a surge protector and a standard outlet.

It is a Corsair CX500 ATX Power Supply

Intel i5-2300 LGA1155 2.8GHz Quad Core Sandy Bridge
4GB Corsair DDR3 1133 RAM
1TB Western Digital 7200RPM SATA 3.0 HDD
nVidia GTS 450

EDIT: It was an incredibly quiet hum, as in almost inaudible for both me and my friend.

Edited by sausage, 28 July 2011 - 07:15 PM.


#4 cryptodan

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Posted 28 July 2011 - 07:20 PM

I would take it back, and say that it will not power on your system and that you tried it on another system and received the same results.

Must have been a bad batch from corsair which is not uncommon when you make so many power supplies in a given day. They do not test each power supply they take a sampling from each batch and test them. Some may slip through the cracks.

#5 sausage

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Posted 28 July 2011 - 07:49 PM

Do you know a way to test the motherboard? The motherboard was Open Box from newegg, but looks pristine, the power supply was brand new.

#6 cryptodan

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Posted 28 July 2011 - 07:52 PM

Test it with another power supply.

#7 sausage

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Posted 28 July 2011 - 08:05 PM

I tested a fan with the power supply and it worked, the main power cable on my only spare psu was too short to connect to my mobo, so no guarantees, it looks fine with no damage, so hopefully it's ok. We'll know later tonight (gonna try and grab a new one from best buy)

#8 sausage

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Posted 28 July 2011 - 10:56 PM

Ok, new PSU works, and I am installing windows now. thanks for the help :)

#9 cryptodan

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Posted 29 July 2011 - 12:04 AM

You are welcome.




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