Question about Dell Dimension 5100 (D51L1) PC Desktop

4 Answers

Dell Dimension 5100 power up problem

Hi, there, any expert:

I have listed my threads under my name Jayjin below the line. Now I had formated the C drive, removed the Vista, and reinstalled the XP OS the night before yesterday, and we could shut down and reboot over and over again, finishing all the necessary installations of software.

But yesterday, my son booted up the Dell, then shut it down, when I got home, I could not reboot the Dell. So I am very very frustrated! The Vista or XP OS seems not an issue here, but why it can't boot up from a hot machine until a second day when the machine is cool and clears all the memory?

The Dell 5100 doesn't give a blue screen, or any green light (1,2,3,4), it either remains dead (with green light on Mobo), or it can reboot up with full functions.

Please give me suggestions, what is wrong. Thanks a million in advance.


posted by jayjin on Sep 02, 2008 Report abuse

My son powered off the Dell 5100 by the push button which was absolutely normal, and it now can't power up. The green LED is lit on the motherboard. Green light on motherboard works. Just a little over 3 years old and out of warranty. I replaced the power cord and used another power extension cord. Problem remains the same.

Give me hints. Thank you a million.

Jay Jin
Comment by jayjin, posted on Sep 03, 2008
Pagebor; Thank you for help. Yesterday afternoon the Dell 5100 booted up and everything returned to normal. I told my son if he shut it down, it would not reboot. And it was true.

I searched if any capacitor has visual breakdown. It doesn't have. I toggled the 115/230v switch, and removed the mobo battery and put it back, it just can't reboot.

I told to my son, if you turn on the next day (i.e. today), it would reboot and be normal.

This problem happened one or two days after my son upgraded the Dell 5100 from XP to Vista Ultimate and with the help of Microsoft Assitance installed the SP1. Then the non-boot problem kicked in. Before he installed the Vista, Microsfot check says it is barely compatible, while Dell check says the Dimension 5100 is not compatible for Vista at all.

Today we will format the C drive if it can be rebooted, and then reveret it to its original XP.

If I am right, then, the Vista Ultimate is causing the problem, in flooding the Cache, jamming the RAM etc. Once a day's time clears all its content, the system can reboot itself. We'll see.

Any suggestion? and tell me why this is happening?

Thank you in advance!

Jay Jin

on Sep 04, 2008 Hi, Everybody;

After we formated the C drive, removing Vista, and reinstalled XP, now the Dell Dimension 5100 returned to normal. It just doesn't have any hardware problem, such as mobo, PSU or RAM.


Posted by on

  • 4 more comments 
  • jayjin Oct 21, 2008

    Indeed, you have not read the threads in which I described symptoms, since the you are still asking if the light is green or amber.

    But you are just too busy to take care every case. Even the Dell tech support asked me to replace the "front control panel and I/O assembly". You are all wrong.

    It is just the "power supply"!!! once it is replaced problem never appeared.

    Thanks anyway.

  • saaaabe Dec 05, 2008

    same proble it was working fine now will not turn on at all green light in mb but anver light in on off button

  • jayjin Dec 10, 2008

    Dear all;

    I have fixed the problem. Even Dell expert recomended to replace the front panel/ button assembly. The culprit turned out be simple-- "The Power Supply", it sometimes won't power on once it is weakened. So reinstallation or restore function, or any software update or change, won't work, since once it booted up, everything is normal. Dell's diagnostic CD did NOT find anything wrong under a running condition. Funny enough, Dell's diagnostic CD and BestBuy's Geek Squad all concluded that the bad "Power Supply" was good.

    Have a Good Holiday.


  • UKUser2 Dec 20, 2008

    I have the same problem and it happened just over 3 years old too, will look into power supply. If there is any Dell Call centre workers out there please tell us if we can get a free one, the call centre I worked for lost the dell contract so I don't have access to staff only information. (Like HP CLJ 2600 get replaced for free if mangetna lazer goes, inside tip for u)

  • boots92 May 11, 2009

    need to find a control cicuit for my push botton accidentally scrathed it know any sites

  • Walter H Boehm May 11, 2010

    Do you mean the the PC won't power on? Does the power button light display a yellow or amber color? Do you have a Dell "Resource CD" ?



4 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I had same issue with dimension 5100 Desktop. I work at Circuit City as the Lead Technician. I found that swapping the power supply did fix the problem! When i initially tested the power supply with a standard power supply tester, the power supply appeared normal. But after swapping the PC works great. Thx for the good idea!

Posted on Dec 21, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

With the dell you coulsd have returned it back to factory bought condition by pressing control and F12 together on reboot its on a seperate secure partition on the hard drive so is always there

Posted on Dec 10, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have repaired this problem on over 2 dozen Dell Inspiron 5100 laptops with power or no boot problems. First make sure you have a 90 watt power supply NOT a 70 watt one. If you have a 70 watt one, get the bigger 90 watt supply cord, as the 70 watt ones were recalled due to being a fire hazard! This solved the issue more times than not.

Next often, it was the memory cards failing in such a way to drag down the bus and preventing the machine from completing the POST (Power On Self Test). Replace them in pairs. They usually fail at the same time. These are inserted at a slight upward angle into the slots, seated, then pushed down and locked in by the two side tabs.

This will solve 90% of all such problems with the Dell Inspiron laptops. (notorious for power problems, get the 90 watt supply!)

Third often, it was a combination of the two above mentioned problems.

Posted on Jun 27, 2010

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

My dell 5100 broke down,amber light flashing,green light on mother board.gave it to repair,could not fix,took advise from this forum and did the following-removed the memory boards[both-if two],put power on,turn power off,replace the memory boards,power up-wow-fixed it.

Posted on Jan 19, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

How do I remove the motherboard from a Dell Dimension Model 5100

You can click the link below to download the online manual for the Dimension 5100 system. The manual provides information for removing/replacing parts within your computer.
Dimension 5100 Online Service Manual
Thank You,
Dell-Jesse L
Dell Social Media and Communities

Oct 02, 2014 | Dell Dimension Computers & Internet

1 Answer

Power supply instalation manual for dimension 5100

power supply installation for dell dimension 5100 is not that much hard, what you need to do is to remove the old power supply and unplug the cable from the mother board

Oct 26, 2011 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

What is the maximum drive size I can install on my SATA controller?

Looks like at least 400Gb see below.

Product Details for 5100 400Gb Desktop SATA Hard Drive This SATA Hard Drive is used and has been tested for proper functionality.
Dell Dimension 5100 400Gb Desktop SATA Hard Drive.

Hope that helps.

Feb 25, 2011 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Hey the good day! where i could get a free download of dimension 5100 motherboard installer driver

Hi Friend,

Please click the link below and download the required drivers of the motherboard of your dell dimension for free.

I hope this will resolve the issue.


May 21, 2010 | 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:

Your responses are intended to improve the level of service provided. Please show your appreciation by rating your experience.
Thank You.

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

3 Answers

Power problem on Dell Dimension 5100

plz check the ram and powersupply unit and try to reset the bios

Sep 02, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

Slave drive into Dell Dimension 5100

Yes it does. It may not have an IDE cable if using SATA hard drive, but it does have a port on the motherboard to plug in the cable you take from your 4600.

Don't forget to rate your answers please!

Jun 07, 2008 | Dell Dimension 4600 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


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)

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


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

Not finding what you are looking for?
Dell Dimension 5100 (D51L1) PC Desktop Logo

7,663 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18408 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

mukhtar21 shaikh
mukhtar21 shaikh

Level 3 Expert

2017 Answers

Are you a Dell Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides