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Computer won't turn on, power supply squeals
We have a PC that's a component of a much bigger system. The system
uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation: http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. Thank you, Ben |
#2
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Computer won't turn on, power supply squeals
Ben wrote:
We have a PC that's a component of a much bigger system. The system uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation: http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. Thank you, Ben Welcome to the world of older Dells. That machine uses a NON standard supply wiring. It is NOT ATX, but rather the 3.3 volts is supplied through a separate connector. Figure 2.5 of the reference and troubleshooting guide shows this. I was unable to locate the proper wiring at the XPS R docs, but the XPS T docs do show it. Check the color codes of the original supply against the, which are found here; http://support.dell.com/support/edoc...in_assignments |
#3
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Computer won't turn on, power supply squeals
On 25 May 2007 11:36:05 -0700, Ben
wrote: We have a PC that's a component of a much bigger system. The system uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation: http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. As Pen mentioned you probably have a system that requires a proprietary Dell PSU. You might find one on the 'net or through Dell, or you might consider having the original repaired (or DIY). Primary point of failure was probably the switching transistors on one of the two heatsinks. |
#4
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Computer won't turn on, power supply squeals
kony wrote:
On 25 May 2007 11:36:05 -0700, Ben wrote: We have a PC that's a component of a much bigger system. The system uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation: http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. As Pen mentioned you probably have a system that requires a proprietary Dell PSU. You might find one on the 'net or through Dell, or you might consider having the original repaired (or DIY). Primary point of failure was probably the switching transistors on one of the two heatsinks. Re Dell parts, you can call or go on line. You could try Dell parts at http://warrantypartsdirect.dell.com/...gram/index.asp or 1-800-357-3355 Dell spare parts. |
#5
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Computer won't turn on, power supply squeals
"Ben" wrote in message ups.com... We have a PC that's a component of a much bigger system. The system uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation: http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. Thank you, Ben Ben Depending on your luck when a power supply is blown up like this, the down stream effects can range from nothing (ie replace the supply and all is well) to all manner of parts fried/spiked. The whining sound usually indicates the power supply is trying to supply current outside it's ratings and going into a shutdown restart cyle at the 'whining' frequency' This overload current could well be caused by fried components in any one of the parts of the PC or something as simple as a loose screw shorting something out. As Pen and Kony have pointed out that model Dell usually requires a 'Dell' specific power supply. If you used a suitable Dell replacement power supply then the symptoms you described suggest there were more fried components in the original motherboard/cpu/ram/hd/fdd/video card (etc) as a result of the overvoltage. Subsequent connection of good parts to damaged parts may well have fried some of the new good components. If you replaced it with a standard ATX supply there is regretfully a good chance you have simply complicated the situation. May I suggest the most productive course of action would be to write the Dell off and tell the owner/user to 'go get a new one'. Then treat all the parts that have been installed in that PC as suspect and auction them off as damaged goods. Best Paul. |
#6
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Computer won't turn on, power supply squeals
On May 25, 11:36 am, Ben wrote:
We have a PC that's a component of a much bigger system. The system uses European-style power (it was made in France), so the computer's power supply must be set to 230 volts. After some recent maintenance, someone forgot to set the PC back to 230 when putting it back into the system. The user turned it on, heard some loud pops, and unplugged it. I was called in to help from there. The power supply smelled like smoke, so I replaced it. When plugged in, the power supply makes a very high-pitched noise and the computer won't turn on at all. I tried replacing the processor, memory, video card and unplugging everything else, but this did not fix the problem. I replaced the motherboard, no dice. I have tried two other power supplies, another processor, different memory, etc. Basically, everything that's hooked up in the system is new, but the power supply still whines and the system won't boot. The power supply only makes the noise when the main power connector to the system board is attached. The system is a Dell XPS R450 with an Intel P2 processor (yes, it's rather old). Some documentation:http://support.dell.com/support/edocs/systems/dkhan/ I'd really appreciate any suggestions anyone might have. Thank you, Ben To clarify a bit on what others have said: The p2 and p3 dells have a propriatary power supply. BUT any power supply pulled from a p2 or p3 dell should work. And it is possible to adapt a standard atx PSU to the dell computer. http://pinouts.ru/Power/dell_atxpower_pinout.shtml http://pinouts.ru/Power/dell_atxaux_pinout.shtml |
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