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I would like for someone to tell me what electrically happens when the power-on button on the front of my dell dimension 5100 computer is depressed to power on the machine. Specifically, what signal/ground is applied to what pins on the motherboard front panel connector and how does that signal/ground activate/ground pin 16 on the main power connector to start the power supply? The motherboard is an Intel Connolly E187242 F2 type board.

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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.

Posted on Aug 24, 2010

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Just come back from a 2 week holiday and my dell dimension 5100 was off but i usually have it on 24/7. having returned from holiday , when i press the power button nothing happens but the yellow l.e.d...


This model has had a very high failure rate. The amber led on front is on to show an error. This can be 1 of 3 things. 1. The power supply has went bad. 2. The motherboard is bad. or 3. The front control panel is bad. Since Dell used proprietary parts on this model you would need to contact them for replacement. www.dell.com will have the contact info. Hope this helps.

Sep 11, 2009 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

No power to Dell demension 5100 desktop


If there is no activity whatsoever when you press the power button on than you have likely blown the internal power supply fuse. This will need a technician to repair.

Apr 10, 2009 | Dell Dimension 5100 (D51L1) PC Desktop

3 Answers

Computer will not turn on at all. Dell Dimension 5100 desktop


I would unplug the power supply from the motherboard, wait a little while and then plug it back in.
Try to power everything back up and it should come up.

I am assuming you are getting a light on the motherboard that indicates power is being supplied?

Feb 15, 2009 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Unable to get front of dell dimension 5100 to check power switch


They say “a picture is worth a thousand words”.
Follow this link: http://support.dell.com/support/edocs/systems/dim5100/en/sm/parts1.htm#wp1371329





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Oct 30, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Power failure


by plugging it directly into the wall... what was it plugged into before. and have you actually taken some other electrical device and plugged it in to make sure the wall socket is still live.
there is also a reset button on most power strips... it may have tripped.

Try those and let us know.

Robert

Sep 07, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Power supply ?


I'd recommend purchasing a new power supply.

Your Dell Dimension 5100 comes stock with a 305W power supply. This is a bare-minimum wattage that will only handle what they ship on the system & not much more. You're better off upgrading the power supply with a compatible after-market model.

You can go to a PC parts store in your area and take your chances...but they're usually more expensive then Internet sources (they've got to pay for their brick-n-mortar store overhead).

Here's a link for a very inexpensive replacement 400W power supply for your Dell Dimension 5100:

http://www.affordablesurplus.com/dell-5100-5150-power-supply.asp

This particular site offers $8 Flat-rate shipping & a 1 year warranty. Your power supply is only $49.99 - you might be able to find it cheaper elsewhere, but that's the best I could find with a quick Google search.

If my answer helped you, please provide feedback :-)

Good luck!

May 05, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

2 Answers

Dell dimension 5100, power button has turned orange


If under warranty contact Dell? I had this same problem, a new motherboard and fan assembly fixed this problem. Bad capacitors on the motherbard.

Apr 12, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

2 Answers

Dell Dimension 5100 Won't start up


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.

Mike

Mar 31, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

4 Answers

Computer won't start


Can you see a green light on located on the mother board ? I had the same problem with mine right after the warrranty was off, The mother board failed, But you should make sure thats it first by making sure everything Inside of the computer is tight and secure.Unplug and make sure there is no power on and unplugged,Before you touch anything inside your computer discharge any static electricity by touching the metal on the inside of the tower. The Memory modules Make sure that they are pushed in securely in there slots and video card is Pushed in and tight, and any other extras you may have plugged into it, After you do all that put everything back and try to reboot see if that get you up and going. If not let me know I can Help You fix it or repair it myself if you would like, just leave message here or email me. bear350cid@yahoo.com Happy Holidays

Dec 15, 2007 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Dell Dimensions 5100 Power Button


The power light is tied to the Mother Board and therefore it could be an issue with just about anything on the PC. Here is the trouble shooting documentation and the link should bring you directly to what the various conditions of the power LED mean.

There is also a detailed listing for the HD light as well as some diagnostic lights (if your paticular variation is equiped)

http://support.dell.com/support/edocs/systems/dim5100/en/sm/tshoot1.htm#wp1114432

Nov 22, 2007 | Dell Dimension 5100 (D51L1) PC Desktop

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