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Dell Dimension 5100 not powering up

Hello, I have a Dell Dimension 5100 computer system. The Motherboard is E187242. The problem: it will not power on I have tried removing memory, replacing power supply with a generic one and nothing seems to work. I have read all of your forums and tried all the suggestions to no avail. I have found one solution:I remove the battery and leave the computer for at least two hours with no cables plugged in and then by crossing my fingers and plugging in all the cables the darn thing powers on. So I guess that I have an open resistor that is not allowing "start circuit" to discharge. My Question: Where can I find the schematics fo the motherboard especially the start up circuit.

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  • Mailman83 May 21, 2009

    I have a similar problem with the same E187242 F2 CONNOLY motherboard in a Dell Dimension 5150. If I reset the CMOS jumpers, the comp will start. If I restart the OS it is not a problem, but if I shut down then I need to re-reset those same jumpers.

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I had a similar problem with my dell dim 5150 and after 3 days of intense research i found the problem. you see mine would not start either and all i had was the green motherboard light on and the yellow light on the power button blinking repeatedly, until i came a cross a post that said to check the USB slots, and so i did, turns out that after a very close look i noticed that one of the pins inside the USB slot were bent upwards and making contact with the metal hense not allowing the pc to boot. i used my wifes eyebrow plucking tool to straighten out the pin and wallah the pc boots up flawlessly now. so take a really close look at those USB slots and make sure all the pins are straight and not touching anything or each other. Good luck

Posted on May 15, 2009

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I guess I have one. But my 5100 won't start if I unplug it for more than 5 minutes. I just try to find the reason why I have to apply the following solution: Dry blower. If I put in high the blower and blow the power supply and the mother board (softly) specially over the battery, it will start. Not matter what

Posted on Dec 30, 2009

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I bet you've tried everything already, but let me ask you this, have you tried reseting your bios & cmos at the same time ? I believe what you need to do is get a whole new motherboard, now the motherboard you have installed is a BTX motherboard, i would recomended that you check out, http://www.geeks.com/ for a new BTX motherboard, that you can use your same ram + cpu + heatsync, and you can easily get this motherboard for around 35.00 - 50.00 dollars, here is a link http://reviews.cnet.com/desktops/dell-dimension-5100-pentium/4507-3118_7-31429803.html?tag=mncol;rnav that shows you all the specs to your motherboard, what you need to look into buying something alike or better....

MAKE SURE ITS A BTX.....

i hope this helps......

Posted on Apr 16, 2009

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The ON/OFF button just "closes" an open circuit, e.g., just like a light-switch on the wall.

You could briefly even "short" the two pins on the motherboard front-panel, with a metal screwdriver, to prove that "closing" the circuit is the trigger to the motherboard to react, either by starting-up, or by shutting-down.

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Is this a DELL system? E series ?
Well , you'll have to reseat the memory chip on the motherboard and check for other power connectors.. but please try this only if you're sure that there is NO display at all and the system will just not start up!
Please make sure you disconnect any peripheral devices and the power cable before opening the chassis!
Please rate this post!

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Don't forget to rate your answers please!

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Hi

First disconnecting the power cord and re-seat all connections (Keyboard, Mouse espercially). Connect up the power cord and try powering the PC.

To help you troubleshoot a problem, Dell Dimension 5100 has four diagnostic lights labeled "1," "2," "3," and "4" on the front panel. When the computer starts normally, the lights flash. After the computer starts, all four lights display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem.

If the computer failed to start up check the diagnostic lights color and sequence and Check the link below for more info (Assuming you have another system that can access internet)
http://support.dell.com/support/edocs/systems/dim5100/en/sm/tshoot1.htm#wp1120147

Alternatively, contact Dell Support with the diagnostic lights color and sequence to raise a service call if the system if under warranty.

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