Question about Dell Dimension 5100 (D51L1) PC Desktop

3 Answers

Dell Dimension 5100 No Power No lights

I have a Dell Dimension 5100 and it will not power up. None of the lights on the front work either. I am getting the green led on the motherboard to light up. But the fan doesn't come on and the hard drive doesn't power up.
So far I have searched the internet and it appears the main causes of this appear to either a bad power supply, a bad motherboard, or shorted USB ports.
So I started with the USB ports and could not see any contacts that would appear to be shorted.
Next I wanted to check the power supply. So I purchased a power supply tester. Unfortunately even though it said it was a 20 and 24 pin tester, it wouldn't work on the 24pin. So I had to buy a different one. Needless to say I could have bought a new power supply by the time I was done. But the tester is showing the supply as ok. And the fan and hard drive powered up when the tester was plugged in.
So that made me about 95% sure it was the motherboard. So I purchased a new motherboard (J8885).
I just finished installing the new motherboard and unfortunately that did not fix the issue. Still same thing. Green LED on motherboard. No other lights. Neither the fan or hard drive cycles.
So I'm a bit frustrated. I feel like I'm throwing good money after bad. I'm about $140 into this with no fix in sight.
Any suggestions from anyone. The only other things I can think is that either somehow the power supply is still bad even though the tester said it was good. Or the switch on the front panel assembly (X8682) is not working to actually turn the computer on?
Is there some way to jumper the pins on the motherboard to try and turn it on without the using the front panel switch? That would let me know if that switch was the problem somehow?
Otherwise I'm left to just try buying a new power supply and hope that is the issue. Or try buying a new front panel assembly and hope that is the fix.
Thanks for any input.

-Eric

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  • 3 more comments 
  • ejesme Mar 08, 2009

    Antiochpc -



    Thanks for responding.

    Unfortunately I don't have an alternative power supply to check with. That is the first thing I looked for. I have two other comps but they both have 20pin connectors. So I'll ask around at work tomorrow or might just break down and buy one. I wish I had done that first...



    I did check the switch on the back of the power supply earlier and it is set to115v



    Unfortunately checking the power switch doesn't appear to be as simple as it should. There aren't colored wired running to the motherboard. This is an integrated control panel assembly (x8682) that has a circuit board with 2 USBs and a mic in and an audio out. It connects via an IDE type flat cable like a hard drive. The actual switch is on the circuit board and there is no way for me to trace the leads back through the IDE cable and there are 39 pins on the motherboard where this connects..



    DickCanFixit - Thanks for responding. See above for why I can't trace the wires. I did previously check all of the removeable stuff before. I should have mentioned that. I removed the memory and tried each one individually. I removed the video card and the modem. None of those had any effect.

  • ejesme Mar 08, 2009

    APremkumar - Thanks for your response. I did run through the Dell No power troubleshooting guide previously. Unfortunately it didn't help resolve the issue.



    Antiochpc - There are 39 pins so it will take a bit, but I can try. Unless you mean only short out 2 that are across or next to each other. Is it likely that is how the power ones would be? Thats why I was hoping someone knew the power pinouts. No risk to the motherboard if short some of the wrong pins?

  • ejesme Mar 08, 2009

    Antiochpc - If it helps here is a chart of the sections of the motherboard. http://www.centrix-intl.com/showpix.asp?...



    In the bottom right corner (Front Panel Input) is where the ribbon cable from the switch on the front of the comp connects.

  • ejesme Mar 08, 2009

    Antiochpc - Ok. Thanks well I appreciate your time and effort. I have seen other online info where people did buy a new front control panel and it resolved it. It is a little circuit board and has the USB ports and i guess those can short and cause the whole switch to go bad. Thus power supply is ok, motherboard is ok, bu can't actually turn on the comp. I agree leave it to dell to over complicate the simple on off switch such that I can't even tell if I have a bad power supply or motherboard. Hopefully I can find someone at work who has a spare power supply I can borrow.

  • bsmithjunk Mar 11, 2009

    My 5150 does the following after unplugging:

    If my usb keyboard and mouse are plugged in, the start button light blinks amber indefinitely and when pushed nothing happens.

    If I unplug, wait a minute or so and replug with the usb keyboard and mouse unplugged the start button blinks 5 times, a short green blink and then the start button boots the machine. Then if I plug in the USB mouse and keyboard it seems to continue working.

    Any help would be appreciated.

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  • Master
  • 564 Answers

Hi Eric,
Don't Worry we can fix this this problem.
This seems to be no power issue.
Just mail your email address and number to apremkuma@gmail.com
Thanks, Prem

Posted on Mar 08, 2009

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  • Dell Master
  • 1,314 Answers

First let me commend you on your troubleshooting skills.

Now this is my advice.

First things first, try a different power supply. It is not uncommon for a power supply tester to give a bad power supply a good rating and they can be had for under $25 or, swap one from another computer that you know is working...it doesn't need to be mounted, just plug in the two motherboard connectors and one to the hard drive (to give it a load) and check it out. Even before that, double check to make sure the red switch on the back of the power supply is set to 115v (or whatever voltage you use, I'm assuming you are in the states).

Now to check the switch. If you have a multimeter handy, all you need to do is figure out which color wires are associated with the switch on the front panel. Usually if you remove the front panel, you can see which colors are associated with the switch. Pull the plug off the motherboard header and test the resistance by putting the multimeter leads into the parts identified by the colors of wires you figured out were to the switch. When you depress the switch, it should show 0 and when you don't, it should show 1. Alternatively you can find out which headers those colors go to on the motherboard and short those two pins with a small screwdriver and see if it powers up.

Good luck and let me know if anything here works. Please take a moment to give this solution a rating of fixya.

Posted on Mar 08, 2009

  • 2 more comments 
  • Kevin Shafer
    Kevin Shafer Mar 08, 2009

    Okay then, remove the plug from the motherboard and take the screwdriver and just short out the headers 2 at a time until you've tried all combinations. In my experience though I have *never* had a bad switch that caused no power that wasn't physically broken. Good luck!

  • Kevin Shafer
    Kevin Shafer Mar 08, 2009

    No, not the 39 pins from the IDE cable....let me check to see if I can find a diagram of your motherboard.....

  • Kevin Shafer
    Kevin Shafer Mar 08, 2009

    Okay, looking at various images of your motherboard, I do not see the normal set of headers I was talking about that most standard motherboards have (leave it to dell!) so no, don't try shorting of the pins since I can't ascertain which pin does what...in normal motherboards, the headers are usually for speaker, power LED, HD LED, Reset, and Switch and shorting any combination of those won't damage the PC, just shorting the switch will turn it on. Hmmmm. But like I've said, I have never seen the switch actually become defective; not saying it couldn't happen its just not a very common issue.

  • Kevin Shafer
    Kevin Shafer Mar 08, 2009

    Yes, come to think of it since it goes to another circuit board before going to your motherboard it could be something in that area. Good luck!

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  • Master
  • 948 Answers

Find where the power switch wires are plugged into the motherboard. Write that location down or take a picture of it. Then unplug that and short those two pins for a moment (power supply connected and turned on). Does your computer come on now? If so, your switch is bad.
Try removing one of the memory modules and then power up. One of them could have gone bad. Onboard video? Have you tried a different or separtate video card?

Posted on Mar 08, 2009

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LCPLgeek
  • 125 Answers

SOURCE: I have a dell dimension 5100 desktop, I installed

hi there, it may not be the mother board, it may be that the graphics card doesn't have the drivers for your system. Bring it to a computer shop and they will install the drivers for you.

Posted on Jan 31, 2010

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