Power supply works... But does not work when I turn computer on

[Antdog500]

Hello, I have a problem with turning on my computer. What I mean by that is that is, when I turn on the power switch on the back of the computer. It makes a very high pitched screech and then it stops. It does the same when I turn it off. I tested to see if my power supply was broken but it seems to be working. Another thing that maybe you should know is that... I have peripheral power connectors and they are not connected to anything. None of my other PC components require them, but I do not know if that is the problem. I was just wondering is their anything that I can do that maybe will help of fix my problem?

Here is my build if you were wondering:

Processor:
Intel Core-i5 3350P Quad-Core
Computer Case:
Rosewill R536-Red (Comes with 500W power supply)
Graphics Card:
Gigabyte GeForce GT 610
Motherboard:
MSI Motherboard DDR3 Z77A-G43
Ram
Corsair Vengeance Blue 8 GB (2X4 GB) PC3-12800 1600mHz DDR3
Hardrive:
WD Blue 1 TB Desktop Hard Drive

 

[lonewolf7]

I think its time to replace the PSU.

 

[geofelt]

Leaving unused connectors open is normal.
I suspect your psu is faulty, and I would RMA it.
Under no circumstances should a psu make unusual noises.

 

[geofelt]

Leaving unused connectors open is normal.
I suspect your psu is faulty, and I would RMA it.
Under no circumstances should a psu make unusual noises.

 

[Antdog500]

No... It does not make unusual noises... It worked when it was disconnected from everything else and made no unusual noises... but when I put the connectors in like the 20+4 pin and the 8 pin it will not turn on! By the unusual noises I can not explain what it sounds like but it is only for like 1 second. Also I just bought the case a few days ago, I do not think any thing is messed up or damaged... I believe it is something I am doing wrong while building it! So do you know anything that may be a common mistake that I can try to fix it!

 

[peacefulduck]

I can't see how unplugged connections would make a screech noise, the most you would ever hear is a popping sound. Similar to exposed electrical connections. If it happens right when you turn on the PSU, my guess is either the bearings on the fan of the PSU (or any fans as I have seen those make all sorts of high pitched sounds) or it could be the speaker on the MB if you have one. It also could be you may have over torqued the screws while putting in the PSU, and the fan is being squeezed somehow. Do you only notice this issue with a certain cords hooked up?

 

[geofelt]

I suggest you remove your parts from the case and connect only what you need.
No hard drive or dvd.
Sometimes a short is the problem.
If your motherboard does not have a power switch, you power on by momentarily touching the two PWR pins on the front panel connector.

 

[Antdog500]

I can't see how unplugged connections would make a screech noise, the most you would ever hear is a popping sound. Similar to exposed electrical connections. If it happens right when you turn on the PSU, my guess is either the bearings on the fan of the PSU (or any fans as I have seen those make all sorts of high pitched sounds) or it could be the speaker on the MB if you have one. It also could be you may have over torqued the screws while putting in the PSU, and the fan is being squeezed somehow. Do you only notice this issue with a certain cords hooked up?

Yeah you hear a pooping sound... but the fan is fine... I unplugged the 20+4 pin connector and did the paper clip test and it started working fine. But when I plug the 20+4 pin connector back in it just goes back to the popping noise!

 

[geofelt]

Sounds like a bad psu or motherboard.

I would try a different psu first.

 

[Antdog500]

I suggest you remove your parts from the case and connect only what you need.
No hard drive or dvd.
Sometimes a short is the problem.
If your motherboard does not have a power switch, you power on by momentarily touching the two PWR pins on the front panel connector.

Did that and the computer fan and the cpu fan suddenly turned for like 1 second and then just stopped!

 

[ko888]

If the motherboard detects that any of the voltages are out of tolerance it will not send a PS_ON# or Power On signal to the power supply unit.

If there is a problem with the +5Vsb or +5V standby circuit of the power supply unit that can also cause the motherboard to not send a Power On signal to the power supply unit.

Have you checked all of the power supply unit's voltages to see if they are all within ATX12V specifications?

 

[Antdog500]

If the motherboard detects that any of the voltages are out of tolerance it will not send a PS_ON# or Power On signal to the power supply unit.

If there is a problem with the +5Vsb or +5V standby circuit of the power supply unit that can also cause the motherboard to not send a Power On signal to the power supply unit.

Have you checked all of the power supply unit's voltages to see if they are all within ATX12V specifications?

Sorry... but where can you check the ATX12V specifications... is it listed ona manual that comes with the case! But the PSU came with the case... and I know they are usually not very good quality... but I tested it and it works. So is it probably the mobo that is the problem?

 

[ko888]

If the motherboard detects that any of the voltages are out of tolerance it will not send a PS_ON# or Power On signal to the power supply unit.

If there is a problem with the +5Vsb or +5V standby circuit of the power supply unit that can also cause the motherboard to not send a Power On signal to the power supply unit.

Have you checked all of the power supply unit's voltages to see if they are all within ATX12V specifications?

Sorry... but where can you check the ATX12V specifications... is it listed ona manual that comes with the case! But the PSU came with the case... and I know they are usually not very good quality... but I tested it and it works. So is it probably the mobo that is the problem?

For troubleshooting purposes borrow and try a different high quality power supply unit.

The chances are quite high that the problem lies with the crap PSU.

Halfway down this web page is a table of the voltage tolerances:

http://en.wikipedia.org/wiki/ATX

 

[Antdog500]

If the motherboard detects that any of the voltages are out of tolerance it will not send a PS_ON# or Power On signal to the power supply unit.

If there is a problem with the +5Vsb or +5V standby circuit of the power supply unit that can also cause the motherboard to not send a Power On signal to the power supply unit.

Have you checked all of the power supply unit's voltages to see if they are all within ATX12V specifications?

Sorry... but where can you check the ATX12V specifications... is it listed ona manual that comes with the case! But the PSU came with the case... and I know they are usually not very good quality... but I tested it and it works. So is it probably the mobo that is the problem?

For troubleshooting purposes borrow and try a different high quality power supply unit.

The chances are quite high that the problem lies with the crap PSU.

Halfway down this web page is a table of the voltage tolerances:

http://en.wikipedia.org/wiki/ATX

Okay thank you but... I don't understand how the problem may be the PSU if it works when it is not plugged in to motherboard.

 

[ko888]

Okay thank you but... I don't understand how the problem may be the PSU if it works when it is not plugged in to motherboard.

Power supply testing without a load is useless.

The purpose of a power supply is to provide power to the system (i.e. load).

There is an interaction between the PSU and the motherboard. If any of the valid voltage conditions is not met the motherboard will not send the Power On signal to the power supply so the power supply will not latch into the On state.