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Dell Dimension 4700 won't start up - no diagnostic lights
My Dimension 4700 froze and when I tried to reboot it would not start. There is a flashing yellow light next to the power button when I try to turn it on. None of the diagnostic lights are on and there is a green light on the mother board. Is this problem a power supply problem? How do you test the power supply?
shesagordie
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November 30th, 2007 22:00
mstkelly
Is the power button LED, solid green, blinking green, solid amber, blinking amber?
What is the reading of the diagnostic LEDs on the back panel?
Unplug the cord from the power supply, hold the power button in for about 15/20 seconds, open the case, unplug the 24-pin connector from the motherboard and jump the Green wire to one of the Black wires, reconnect the power cord and if power supply fan and hard drive runs, then the PSU should be good.
Note= Do not remove any wires from the plug, use a small piece of wire or a paper clip as a jumper.
Bev.
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mstkelly
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December 1st, 2007 00:00
mstkelly
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December 1st, 2007 00:00
shesagordie
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December 1st, 2007 02:00
Have you checked that all the power cables are properly connected, by removing and reseating them.
Which fan is not running, the case fan or the power supply fan?
As the Power supply seems to check out and the system still does not work, again remove power cord, hold power button in to discharge the residue power, reconnect the 24-pin connector to the motherboard.
Remove all the PCI cards, the video card [if applicable], memory, all peripherals, disconnect the data and power cables to all the drives, then check that the front panel cable is connected to motherboard, with nothing else connected to the system, except the power cable, power the system on.
If you do not get any beep codes or no diagnostic lights on the back panel, then it would appear that motherboard has died.
Bev.
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mstkelly
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December 1st, 2007 10:00
mstkelly
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December 1st, 2007 11:00
shesagordie
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December 1st, 2007 20:00
If the power supply fan does not work, then that could indicate a bad power supply. Try installing different PSU first, because to check the motherboard, you need a known working power supply.
Bev.
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Message Edited by shesagordie on 12-01-2007 04:19 PM
mstkelly
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December 2nd, 2007 01:00
shesagordie
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December 2nd, 2007 02:00
That's great, pleased to hear the problem is resolved. :)
Bev.
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cyz4rds
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August 22nd, 2010 11:00
Hi Bev, thanks much for the help. The jump trick worked and now the fan comes on. I've got none of the LED lights however. Based on what your earlier post it sounds like the motherboard.
Dave
shesagordie
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August 22nd, 2010 12:00
cyz4rds
I'll assume that you have a dimension 4700.
Yep, it sure does sound like the motherboard.
Is the power button LED, solid green, blinking green, solid amber, blinking amber, or off?
Did you also, check to see if the hard drive worked?
Bev.
sommruth
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December 11th, 2014 09:00
I have a Dell Dimension 4700, and I just ran all the tests you suggested. My PSU is working fine, power button blinks yellow, no diagnostic lights. It runs for about exactly 30 seconds then stops.
shesagordie
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December 11th, 2014 11:00
sommruth
Could be motherboard failure..
Are there any 'Beeps'?
If you are comfortable working around computers, you could try the following:
Note: The only 100% method of testing a PSU, is to install a known working power supply.
Unplug the cord from the power supply, hold the power button in for about 15/20 seconds, open the case, unplug the 24-pin power connector from the motherboard and jump the Green wire to one of the Black wires, reconnect the power cord and power the system on, if power supply, case fans and the hard drive run, then the PSU may be good.
Note: Do not remove any wires from the plug, use a small piece of wire or a paper clip as a jumper.
Power supply checks out and the system still does not work, again remove the power cord, hold the power button in for several seconds to discharge the residue power, reconnect the 24-pin connector to the motherboard.
Remove all the PCI cards, the video card [if applicable], memory, all peripherals, disconnect the data and power cables to all the drives, check that the front panel cable is connected to motherboard, with nothing else connected to the system, reconnect the power cable and power the system on.
If there is no difference in the diagnostic lights, 'Beep' codes and/or the LED indication of the power button, then it would appear that the motherboard has died and/or maybe the processor.
Note: The good news is, processors rarely fail, as the only method I know of checking a processor, is to install it a compatible working PC, or use a known working processor.
http://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_dimension_desktops/dimension-4700_service%20manual_en-us.pdf
Bev.