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This is a discussion on PSU trouble - Replacing... within the RAM and Power Supply Support forums, part of the Tech Support Forum category. Hi everyone... I just went to replace my power supply on a Dell Dimension 9100. I ordered a 9800GT and


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Old 01-15-2010, 06:09 PM   #1
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Hi everyone...

I just went to replace my power supply on a Dell Dimension 9100. I ordered a 9800GT and needed a larger power supply. I purchased a 750W from newegg, as it was on a large sale.

Anyway, I unplugged everything and took out my old power supply, and I put my new one in, and I believe I hooked everything up properly. My computer light turns on, but my monitor is black. I also noticed that any USB device that is plugged in does not receive any power.

Does anyone know why USB devices aren't receiving power and my monitor is black? Did i miss something here?

Please. Any help is appreciated.

thank you
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Old 01-15-2010, 06:34 PM   #2
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Did you plug in your +12 molex? Did you plug your power supply in to the video card?
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Old 01-15-2010, 07:10 PM   #3
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Well...I guess I was missing a 4-pin connector.

I hooked that up, powered on, and smoke came out of the PSU...

The 4 pin connector is melted and ****...

Does this mean a new PSU? New computer? New motherboard?

fml.
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Old 01-16-2010, 12:27 AM   #4
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When you "let the magic smoke out", it's almost certainly dead. Can't see it not being
toast, but stranger things have happened. Your motherboard may be going to the
same place, how does the socket look for the melted 4 pin?
What's the make and model of your deceased psu?
The cheapies are somewhat lacking in protections, and a dying psu can and will send
voltage spikes, quality psu's have better overvoltage protection, making them more
likely to just shut down, not hosing other components.
Unfortunately, aside from a visual inspection, you won't know about the rest of the
system until you try it. You can test parts in another pc, or borrow a psu from
someone who has a spare. Make sure it's a spare, just in case. Also it needs to be
half decent and sufficiently powered for the system, testing with a substandard psu
inadequate wattage and amperage, would not be a good thing.
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