PC wont power up

[russellashley]

My old PC wouldnt power up. I checked the PSU by shorting the green and black wires. The fan turned. I assumed the PSU was OK. Tried shorting the power switch on the MOBO with a screwdriver but no power. I ssumed that the MOBO was fried. I have bought a new MOBO and case and then rebuilt the PC with the hardware from the old machine into the new MOBO. Same issue- the new machine will not switch on. Ive tried all the the connections, they are good.
Could this be a PSU issue still? The new MOBO wont power on with a screwdriver across the power switch pins. Can the fan turn but the PSU still be faulty?
Thje only issue i had with the old build was a problem with the HDD where i had to F1 it at boot due to bad sector or something on the HDD. It booted fine after F1, just didnt have full capacity.
Bulid-

GA-970A-DS3P FX Gigabyte (MOBO) (NEW)
400W Power Man PSU
GTX650
Phenom II X4 CPU
KVR13N9S8/4 4GB RAM (new)

 

[alexoiu]

If removing the CPU 4 pin power cable and starting the board, do the case fans spin?

 

[russellashley]

If removing the CPU 4 pin power cable and starting the board, do the case fans spin?

How do i start the board without power from the PSU?

 

[russellashley]

If removing the CPU 4 pin power cable and starting the board, do the case fans spin?

Sorry- just read properly what you said. Ill check!

 

[russellashley]

If removing the CPU 4 pin power cable and starting the board, do the case fans spin?

No they dont. Its as dead as a doornail. You can hear a high pitch noise coming from the PSU as if its recieving power but nothing is responding at all

 

[alexoiu]

Try testing the board outside the case.

 

[russellashley]

Try testing the board outside the case.

Just done a breadboard set up. No beeps when i shorted the power pins with screwdriver. Im guessing its a faulty PSU then?

 

[alexoiu]

Did the fans spin?

 

[russellashley]

Did the fans spin?

No, absolutely nothing

 

[alexoiu]

Try different power supply, if possible. It looks like a motherboard issue, though.

 

[russellashley]

Try different power supply, if possible. It looks like a motherboard issue, though.

OK. Just ssems coincidental that the issue first occurred on a totally different motherboard. I thought it was a mobo issue that time so bought a new one but this is the same problem now as before. Ill get a new PSU on payday (thursday) and try that. Just seems odd that two mobos would have the same issues, one completely new?

Thanks for your guidance though- i will repost either way later in the week.

 

[alexoiu]

No problem. Make sure that you can return the power supply, if not solving the problem.

 

[russellashley]

will do- i need a 500W one anyway so its all good. If that doesnt solve it i will return the mobo and try again!

 

[russellashley]

No problem. Make sure that you can return the power supply, if not solving the problem.

Sweet, New PSU installed and bingo! everything powers up now. Only issue is nothing coming through on monitor now. Im thinking its the RAM i bought isnt compatible so wont boot. Just bought some thats definately supported so fingers x'd

 

[alexoiu]

Whatever damaged the board and power supply might have affected the CPU too.

 

[russellashley]

Im not getting any beeps from my on board speaker to tell me that anything is faulty.....

 

[alexoiu]

If no beeps when RAMs removed, then board, or CPU. Since board ruled out...

 

[russellashley]

Thanks mate. Just ordered new AMD FX4300 Quad core. Hopefully this will crack it. Winder what caused the problem. Faulty PSU maybe.

 

[alexoiu]

No problem.

 

[russellashley]

No problem.

Thanks mate. New CPU installed - boots up. Just playing getting everything smooth now, drivers etc etc. Thanks a lot- you really helped me solve this.

 

[alexoiu]

You're welcome. Glad you've solved it.