Question about Dell Dimension 5100 (D51L1) PC Desktop

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Dell desktop is not turning on !help i tryed it all

Dell desktop is not turning on ! i reset every thing replaced the power supply let it set for 30 mins what it there to do ??

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  • 22 Answers

You need to replace the motherboard and the IO panel.

Posted on May 04, 2010

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1 Answer

Power turns but screen stays black no


Try anouther screen . turn off, unplug, hold in the power button for 30 seconds, release plug in and try agin. this sometimes reset the capacitors on the board. can you hear the sound as it starts up also is there any lites on the back around the power supply?

Oct 18, 2013 | Dell OptiPlex Computers & Internet

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Have a Dell Optiplex 740 desktop. Power button is lit solid orange. No diagnostic lights on. Fans still blowing. Replaced power supply unit still nothing. HELP!!!!!


before replacing main board,try replacing individual hardwares like ram,processor and if still not working,try resetting the bios by alternating the jumper on the labelled CLR CMOS

good luck

Mar 28, 2013 | Dell OptiPlex 740 PC Desktop

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Dell deminsion 4700 when i moved it,monitor,mouse,keyboard quit.monitor briefly displays power safe mode.pressing any key don't help


When you moved your pc you probably knocked the graphics card loose. You can open it up and try re-seating it. Make sure you unplug the pc first and then press the on button for 10 seconds to clear out all the power from the power supply before opening the computer up.

Also, If you are using a KVM... Unplug the KVM's power cord for 30 seconds and plug it back in. That will reset it.

May 14, 2012 | Dell Dimension 4700 PC Desktop

2 Answers

Machine will not turn on. I've tried replacing the power supply and the on/off button. I get a green light on the motherboard but nothing else..


Verify that the RESET switch isn't short circuited, misconnected, or stuck (just pull the RESET cable off the motherboard connector temporarily and see what happens).

Any other error condition should, if the speaker is working, make itself known with a coded beep sequence.

Jan 12, 2010 | Dell Dimension 2400 PC Desktop

1 Answer

My xps 420 pc desktop wont boot. Shut it down last


Try and reset your CMOS and see if it helps.

If you're not sure how, then unplug the power cable from your PC, then take off the side panel, on the motherboard is a set of 2 or 3 pins to Clear the CMOS (reset the BIOS) all boards are different, so there is no set location for the CMOS pins, if you're unsure, just remove the battery from the motherboard for about 30 seconds, then replace it ("+" facing up)

But you need to make sure your PS is not plugged into any external power source while you're doing this or you risk deleting your BIOS

Hope this helps in some way.

Jan 01, 2010 | Dell XPS 420 PC Desktop

1 Answer

Help to replace on/off swith on dell


Why do you think it needs replacing? What kind of Dell PC is it? Be advised that it's normal to have to hold it down for 4 seconds to turn it off. Jumping the pins on the motherboard should turn the computer on if the switch won't. If it will turn on by jumping the pins, then the switch may be bad, but it's not a very common part to fail. Replacing it should be pretty simple, if you have the replacement part.

More likely that the power supply is bad, or may be set to the wrong voltage (rear of the unit). (Desktop power supplies don't auto-switch for different voltages the way that laptop power supplies do.)

Oct 06, 2009 | Dell Dimension 2400 PC Desktop

1 Answer

Computer won't turn on


A flashing yellow power LED is an indication of a failure in the power supply. If under warranty, Dell should be replacing it. If out of warranty, then a 400/450 Watt ATX power supply should resolve the issue.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182021

Apr 06, 2009 | Dell Dimension™ E510 PC Desktop

2 Answers

Problem turnining computer power on


your power supply is going bad, its an easy thing to replace and less than sixty dollars to replace for about a 450 watt power supply

Dec 06, 2008 | Dell Inspiron 530s Desktop Computer...

1 Answer

Amber light on power button of Dell Dimension 4500


ok - the amber light of doom on a dell means one of two things - either your power supply is pooched - or your motherboard, If under warranty dell will send out a friendly tech to replace them - if not it will cost you a bit. get the price and consider if it worth upgrading instead. Contact your dell rep or dell tech support and see what they say

cheers Pete

Nov 30, 2008 | Dell Dimension 4500 PC Desktop

2 Answers

Dell Dimension E510 Problem


here are just a few things I would suspect.

One of those windows in the BIOS settings will display all the voltages at spec and the actual voltage. There should not be more than a 10% difference above or below. As you seem unafriad of your computer could you remove the left side and see what the make and model of the power supply is. It should give spec and voltages.

Second is your Cmos battery weak, was it individually packaged and is there a date on it, Try getting one from a different source to make sure you are getting a different lot or try a different brand. Look at the contacts on pc for the battery look for signs of oxidation. Look at the soldering to see if it looks damaged or bad, they can crack or break. Some one with a tester could check them to see if they are good. Of course, make sure you are connecting the battery with the correct polarity. Also, check for a leaky capacitor on the motherboard.
When you are taking out the cmos are you just immediately putting the new one in and then restarting? If so do this instead, unplug from power, remove cmos battery, leave it just like that for at least 30 mins. This allows a good power cycling. Then replace with good new battery (you can have the battery tested for strength) if battery has date codes you can check for freshness, you want to try to get a fresh one, after install of battery, plug in and try it. Sometimes a minimum 30 min power cycling resets things. Also, What else is installed and how much "stuff" is connected to the USB ports but is not self powered? Now the amber light ... Unplug computer, disconnect all usb/monitor/internet, open it, hold power button until green led on the inside on the motherboard turns off, pop out the battery. Plug in computer, hold power button for about 20 seconds (must reset BIOS), let up on power button, wait 10 seconds and push power button. The computer should turn on. Wait for it until activity seems stable (1 min. or so). Push powerbutton to shut off.

If this has worked you have proven that it's not the power supply (it turned on).

Go buy a new battery (CR2032 3 volt). Unplug computer, open it, hold power button until green led on the inside on the motherboard turns off, pop in new battery, plug in (you should notice the power button blinking amber again), hold power button until it stops blinking (about 20 sec....again must reset BIOS), wait 10 sec., push power button. the computer should turn on. Wait for it until activity seems stabe (1 min. or so). Push powerbutton to shut off.

Now, close case, plug in all usb/monitor/internet/etc. Power up computer. You'll get an internal floppy drive error. Push F2 (maybe F1) to get into the BIOS settings and go to "drives" and turn off the internal floppy. Save and exit. The computer should boot properly now.

This seems to be a big problem with the e510, my theory is that this one small battery is the root of most of these failures (as these computers usually fail after 1-2 years), not the power supply or the motherboard (heck, when you replace the motherboard it comes with a new one of these batteries...a several hundred dollar piece of hardware, with a $5 battery that will actually fix it). Those are a few things to look at for now.


Nov 05, 2008 | Dell Dimension 5150 (DIM515MIN) PC Desktop

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