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Desktop won't boot-Blinking orange led in unison w/ blinking green h/d led

Discussion in 'Hardware' started by geno368, Sep 30, 2008.

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  1. geno368

    geno368 Thread Starter

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    My sister has a Dell Dimension 5100 w/XP Prof., 1MB Ram, Pent 4 @ 3.2 ghz. All of a sudden it won't boot. When you plug in the power, the power switch led blinks orange in unison with the h/d green led.
    This is what I have tried:
    I pulled the power supply 24p connector and shorted the black wire to the green wire and the fan then came on..so I figure p/s is ok?????
    I then removed the modem card and the video card as well as the memory and all drive connectors. Still same response. What do I need to check? Motherboard bad??Thanks
     
  2. shinybeast

    shinybeast Malware Specialist

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    The power supply may be deteriorated to the point that there is not enough power to run the CPU, but it can run the fan. Better testing of PSU would be required. Or put different PSU in and see what happens. If it still doesn't work, it could be the CPU or motherboard.
     
  3. geno368

    geno368 Thread Starter

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    how do I check the output of the P/S? I have a volt/ohm meter
     
  4. crjdriver

    crjdriver Moderator

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    Just because a fan comes on really means nothing. The quickest way to test a pw supply is to swap in a known good unit.

    You have three different voltages in a psu; 3.3V, 5V, and 12V. You could have one fail and the fan still comes on.
     
  5. crjdriver

    crjdriver Moderator

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    BTW even shorting the psu and using a volt meter does not test the system under a load. It only shows the no load voltage. It could be very different when attempting to pw ON the system.

    One last item. Modern dells use standard atx pw supplies however older ones use a proprietary unit. Check with dell to see what type you use. FWIW the proprietary unit uses the same connector so you cannot tell by the atx connector.
     
  6. geno368

    geno368 Thread Starter

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    I have a damaged X8543 front panel on this system if anyone has one for sale. One of the two USB ports is damages. I also need to know if the damaged USB port on this panel could cause the blinking amber light and no boot. I have replaced the PSU already. If the port is shorted to ground, would it damage the MB?
     
  7. geno368

    geno368 Thread Starter

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    Solved.....I finally found a front i/o panel assembly and replaced the shorted one. I replaced the cmos battery I had pulled and...it's back to normal....Thanks for all the help
     
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