Dimension C521 will not turn on
in [Dell]
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From: tiyogi on 7 Sep 2008 11:22 The unit was running during thunder storm. There was a power failure during the storm and electrical power was lost in the area. When the power returned and the unit would not turn on. I have read through a number of posts on the various forums looking for help. Here is what I have done so far 1. When the power button is pushed in there is a audible click click. (from Dell forum) 2. When the power button is pushed in the is no response, no fan no hard drive nothing. 3. When the power button is pushed in the is momentary flashing of the light ( sorry unable determine color). The light just blinks on then off as the button is pushed. 4. When the plug is plugged into the power supply there is a amber light on the MB with the label AUX PWR LED 5. I have removed all the connections and resetted them. 6. I have tested the power supply with one of those plug in type which give a go/no go lights. All of the lights come on except for the -5v. There is no list of a -5v on the power supply. The tester is used is an older model of the this one mine does not have the newer connection only the older types 20 pin, 4 pin PATA, 4 pin fan and floppy PW tester: 'Thermaltakeusa » Power Supply » Accessory » Dr. Power : Dr. Power A2358' (http://www.thermaltakeusa.com/Product.aspx?C=1266&ID=1545) I also see that their are replacement unit sold on E-bay for about $30. Since money is tight around here I would rather hold off spending it until all other suggestes are tryed out. I did see the suggestion about using a wire to short out the connector, I have not done this yet. (from Dell forum) Question: I know that the shape of the supply rules out a normal ATX power supply, but does the unit use standard ATX power pin out for the 24 pin connector? Question: Would it be possible to use a 20 pin power supply with an adapter 20-24 pin to test the motherboard? So this is what I have done so far any additional suggestions? :>
From: Ben Myers on 8 Sep 2008 10:48 Replace the power supply and hope that everything else has not been damaged. Unless Dell has chosen a wretched Bestec power supply for this model (unlikely, but turning up in other Dell desktops, sadly), the power supply may have sacrificed itself for the rest of the system. So get another power supply and see what the next step is... Ben Myers On Sun, 7 Sep 2008 10:22:30 -0500, tiyogi <tiyogi.3ff94r(a)no.email.invalid> wrote: > >The unit was running during thunder storm. There was a power failure >during the storm and electrical power was lost in the area. When the >power returned and the unit would not turn on. > >I have read through a number of posts on the various forums looking for >help. > >Here is what I have done so far >1. When the power button is pushed in there is a audible click >click. (from Dell forum) >2. When the power button is pushed in the is no response, no fan no >hard drive nothing. >3. When the power button is pushed in the is momentary flashing of >the light ( sorry unable determine color). The light just blinks on then >off as the button is pushed. >4. When the plug is plugged into the power supply there is a amber >light on the MB with the label AUX PWR LED >5. I have removed all the connections and resetted them. >6. I have tested the power supply with one of those plug in type >which give a go/no go lights. All of the lights come on except for the >-5v. There is no list of a -5v on the power supply. > >The tester is used is an older model of the this one mine does not have >the newer connection only the older types 20 pin, 4 pin PATA, 4 pin fan >and floppy > >PW tester: 'Thermaltakeusa » Power Supply » Accessory » Dr. Power : >Dr. Power A2358' >(http://www.thermaltakeusa.com/Product.aspx?C=1266&ID=1545) > >I also see that their are replacement unit sold on E-bay for about $30. >Since money is tight around here I would rather hold off spending it >until all other suggestes are tryed out. > >I did see the suggestion about using a wire to short out the >connector, I have not done this yet. (from Dell forum) > >Question: I know that the shape of the supply rules out a normal ATX >power supply, but does the unit use standard ATX power pin out for the >24 pin connector? > >Question: Would it be possible to use a 20 pin power supply with an >adapter 20-24 pin to test the motherboard? > >So this is what I have done so far any additional suggestions? >:> >
From: William R. Walsh on 8 Sep 2008 12:08 Hi! > Here is what I have done so far It sounds like you've covered the bases pretty well. However, have you tried to see if the system will power on with only the motherboard connected? > 3. When the power button is pushed in the is momentary flashing > of the light ( sorry unable determine color). The light just blinks > on then off as the button is pushed. This could indicate that the power supply is shutting down due to a short circuit or overload. I tend to think that the supply should be good, especially since the "AUX PWR LED" on the motherboard is on. > All of the lights come on except for the -5v. There is no list > of a -5v on the power supply. Some power supplies don't provide a -5V output. This is especially true of newer ones. > I did see the suggestion about using a wire to short out the > connector, I have not done this yet. (from Dell forum) If you do, disconnect things like the hard disk. This could really save your day if the power supply is bad and happens to go wildly out of control when you force it to turn on. > Question: I know that the shape of the supply rules out a > normal ATX power supply, but does the unit use standard > ATX power pin out for the 24 pin connector? Yes, it should. Dell was using the ATX connectors but changing the pinout so a regular power supply would not work. Fortunately, they stopped doing that a long time ago. William
From: gregg on 8 Sep 2008 18:05 On Mon, 08 Sep 2008 10:48:26 -0400, Ben Myers <ben_myers_spam_me_not(a)charter.net> wrote: >Replace the power supply and hope that everything else has not been damaged. >Unless Dell has chosen a wretched Bestec power supply for this model (unlikely, >but turning up in other Dell desktops, sadly), the power supply may have >sacrificed itself for the rest of the system. So get another power supply and >see what the next step is... Ben Myers > >On Sun, 7 Sep 2008 10:22:30 -0500, tiyogi <tiyogi.3ff94r(a)no.email.invalid> >wrote: > >> >>The unit was running during thunder storm. There was a power failure >>during the storm and electrical power was lost in the area. When the >>power returned and the unit would not turn on. >> >>I have read through a number of posts on the various forums looking for >>help. >> >>Here is what I have done so far >>1. When the power button is pushed in there is a audible click >>click. (from Dell forum) >>2. When the power button is pushed in the is no response, no fan no >>hard drive nothing. >>3. When the power button is pushed in the is momentary flashing of >>the light ( sorry unable determine color). The light just blinks on then >>off as the button is pushed. >>4. When the plug is plugged into the power supply there is a amber >>light on the MB with the label AUX PWR LED >>5. I have removed all the connections and resetted them. >>6. I have tested the power supply with one of those plug in type >>which give a go/no go lights. All of the lights come on except for the >>-5v. There is no list of a -5v on the power supply. >> >>The tester is used is an older model of the this one mine does not have >>the newer connection only the older types 20 pin, 4 pin PATA, 4 pin fan >>and floppy >> >>PW tester: 'Thermaltakeusa » Power Supply » Accessory » Dr. Power : >>Dr. Power A2358' >>(http://www.thermaltakeusa.com/Product.aspx?C=1266&ID=1545) >> >>I also see that their are replacement unit sold on E-bay for about $30. >>Since money is tight around here I would rather hold off spending it >>until all other suggestes are tryed out. >> >>I did see the suggestion about using a wire to short out the >>connector, I have not done this yet. (from Dell forum) >> >>Question: I know that the shape of the supply rules out a normal ATX >>power supply, but does the unit use standard ATX power pin out for the >>24 pin connector? >> >>Question: Would it be possible to use a 20 pin power supply with an >>adapter 20-24 pin to test the motherboard? >> >>So this is what I have done so far any additional suggestions? >>:> >> I agree with Ben about going ahead and replacing the power supply. The next step would be the MB and you really don't want to go there. Odds are the Power supply is bad. Shame you don't know someone with a good one you could try out. Gregg
From: gregg on 8 Sep 2008 18:08
On Mon, 08 Sep 2008 10:48:26 -0400, Ben Myers <ben_myers_spam_me_not(a)charter.net> wrote: >>Question: I know that the shape of the supply rules out a normal ATX >>power supply, but does the unit use standard ATX power pin out for the >>24 pin connector? >> >>Question: Would it be possible to use a 20 pin power supply with an >>adapter 20-24 pin to test the motherboard? >> >>So this is what I have done so far any additional suggestions? >>:> >> I don't know what the pin is on the power supply, but I would bet it not to be the standard 24 pin connector. There are adapters. As long as the other specs are ok, you would just have to modify your case to make it work. |