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Replaced power supply. Now have multiple problems.


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#1 progrocker

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Posted 09 September 2014 - 08:24 AM

Hi folks, any help here would be greatly appreciated. I have a desktop PC built by a guy in a garage about 5 years ago. It runs Windows XP. Three nights ago I shut the PC down. No signs of trouble at that point. The next morning I went to power it up. I pressed the button and absolutely nothing happened. I suspected a bad power supply so I purchased one locally and installed it myself. I have a minimum of technical knowledge or experience but have replaced several hardware items in the past, including a disc drive, hard drive, RAM cards, etc. After installing the power supply, I booted up the PC. No beeps. The fans run, the tower lights up and all seems normal, but 2 problems have arisen; #1, No video. The monitor acts like it is not receiving any signal from the PC. #2. The USB ports will not power the optical mouse.

Oddly enough, the USB ports do have power; I hooked up my cell-phone charger to the ports and in each case, the phone indicates "charging" on the display screen. But it won't light up the optical mouse. Despite a relatively uneventful installation process, these events have me thinking I have done something wrong. Any thoughts ? Despite having installed some hardware, I'm pretty tech-ignorant, so if you would be so kind, please try to avoid jargon and dumb down your answer as much as possible. (example; "plug the red thing into the blue space") Thanks in advance !

 



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#2 jonuk76

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Posted 09 September 2014 - 12:55 PM

Ensure you have connected all of the required power leads to the motherboard.  I've a sneaking suspicion from the description you might not have plugged in the 4/8 pin ATX12v connector (which powers the CPU).  Older boards need a 4 pin connector.  Many newer ones use an 8 pin.  The connector is usually supplied as 2 x 4 pin connectors that can be joined together to fit an 8 pin board.  The motherboards CPU power connector is usually located near the CPU.

 

Image of 4/8 Pin ATX12v power supply connector:

1549B5D2D6C5294EF2C1F57476400AC5.jpg

 

Image of 4 Pin ATX12v connector on motherboard:

motherboard-atx-12v-power-connector.jpg

 

Secondly if you have a higher spec video card it might need to have one or more PCIe connectors from the PSU fitted.  These are 6/8 pin connectors, usually labelled "PCIE".

 


7sbvuf-6.png


#3 progrocker

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Posted 10 September 2014 - 11:47 PM

Thanks Jon, I learned a long time ago that once I discover I'm in over my head, the best course of action is to stop digging. I put down my shovel and took my PC to a repair shop. It's a lot safer in their hands than in mine.






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