Question about Dell Dimension E521 PC Desktop

3 Answers

Dimension e 521 screen black

The computer is on the fan is working. nothing shows up on the screen
and it keeps flashing the number 3 and 4 by the cd drive.

Posted by on

  • 4 more comments 
  • cwilson531 Dec 30, 2008

    dimension e 521 screen black the computer is on the fan is working. nothing shows up on the screen and it keeps flashing the number 3 and 4 by the cd

  • kane1297 Feb 09, 2009

    my dell dimension e521 no signal black screen,but on the front i noticed the two numbers 3 and 4 flashing

  • overdes Mar 18, 2009

    my dell dimension e521 no signal black screen,but on the front i noticed the two numbers 3 and 4 flashing, pls help!

  • wolfmajor Apr 30, 2009

    Same thing here. Dell E521 about 1 year old running Vista Home. It's my grandfather's system and he has a bad habit of ungracefully shutting it down if he doesn't understand something on the screen (like an error message). Then it started to go right into sleep mode upon boot. I never saw a logo, BIOS info, or the Windows screen...just black. The monitor power light would go green for about 2 seconds during the beginning of boot, then immediately to orange (indicating sleep mode or no signal).

    I replaced the power supply, motherboard, and video card...nothing worked. I tried to log in without seeing the screen, hoping I could get past sleep mode. Nothing wakes it...mouse, keyboard, power button, etc...nothing. I even questioned whether or not it was booting fully up to Windows or not (system is very quiet for a cheap machine).

    Now, we're getting him a barebones system and I have the Dell to troubleshoot. I have not yet tried removing one of the RAM sticks for a new boot....will do that next. I have disconnected everything else...

    Frustrated in NH. :-(

  • rone42 May 25, 2009

    do you thing you can help me fix my computer it is saying windows error recovery and saying windows failed to start please tell what going on with the computer please!!!!!!!!!!!!!!!!!!!!!!!!!

  • wolfmajor May 11, 2010

    I forgot to mention that the diagnostic lights #1 & #4 are on. There is no reference in the Dell manual regarding these 2 lights on at the same time. Anyone have any ideas? Thx.


3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I reseated the memory module and the computer booted normally. Your suggestion worked, thank you.

Posted on Dec 30, 2008

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 7 Answers


Posted on May 26, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 115 Answers

Change your computers memory module and have a try.

Posted on Dec 17, 2008

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

My cd-rom on dell Dimension 8250 pc desktop computer will not show up on my computer. Am i missing cd-rom drivers.

1.first go to
click on the green button that has run now
Run the microsft fix it tool
if it works GREAT! if not go to #2
#2 go to this site
follow instructions
IF THAT WORKS GREAT! if not proceed to 3
#3 turn off computer unplug power cord.
open your computer case unplug the cables that connect to the back of the cd rom. plug computer back in power it up. shut it down once it loads. then once it is powered down open case again and plug the cables back in make sure they are connected well. close case and power up the computer.

hope that helps

Nov 25, 2012 | Dell Dimension 8250 PC Desktop

1 Answer

Describe your dell dimension E521 wont boot and Problem my computer turns on but doesn't open it goes to a black screen with little flashing bar in top left corner nothing new was installed but there...

The 123 lights on tower translates as:

Routine system activity subsequent to video initialization.
Watch your monitor for on-screen messages.

Disconnect the video cable from the computer and see if you get floating color bars on display. If not, your monitor is defective.

Jan 10, 2011 | Dell Dimension E521 PC Desktop

2 Answers

When I turn my comp on, I get the Dell screen, then a black screen with a flashin cursor. When pressing f8 for safe-mode, nothing happens. Just a black screen with flashing cursor. Please help

Unplug all external USB devices to your computer and power it back up again.

If you can start the computer, then you probably have a faulty USB device connected to your computer.

Nov 15, 2010 | Dell Dimension 2400 PC Desktop

2 Answers

I have a dell computer it is around 7 years old,it has windows xp on it 2400.The other day I click on something that made the screen black now all it does is show the logo on the moniter when I first turn...

Try to access the BIOS by going into setup after you power-up the computer. In the BIOS check to see if the harddrive is listed. If it isn't then the harddrive is bad. Also, set the BIOS so that the computer will boot from the CD drive. Save the new BIOS setting, load the CD, then reboot the computer. Follow the prompts from the setup process. Usually a "repair" of the XP operating system may fix the problem. You can also go to the Dell website, enter your service tag number and read the troubleshooting section for your computer. If you don't have the CD, ask a friend who also owns a Dell with XP and barrow their CD. It will work with yours.

Oct 28, 2010 | Dell Dimension 2400 PC Desktop

2 Answers

My dell dimension 5521's lights 3 and 4 flash, nothing on screen

Have you tried booting up in safe mode to see if it comes on then. If you can then you will have installed something that isnt working with your computer which is causing it not to boot properly. When you swith the comp on you should see some option ie f2 for boot menu. I think its f8 you need to keep pressing then you will get another menu after a couple of seconds saying boot in safe mode, boot in safe mode with networking, boot windows normally or boot windows in last known working state. boot in safe mode see if it works. Hope this helps.

Oct 20, 2009 | PC Desktops

1 Answer

How to reset my dell computer dimension 2400 back to factory settings. when I turn on the computer I was told oce I see the blue dell logo to press CTRL F11 but it want bring nothing up to default it back!...

Here are the Dell instructions for PC-Restore. The actual process is listed in step 3
When you start the system, after the Dell Splash Screen, there should be a black screen with a blue bar across the top with in white letters. If that page does not show, then PC-Restore will not work. If you do see that screen, you have to be very fast with the CTRL+F11 key combination at that screen. It should open PC Restore by symantec. On a system this old, it if very likely the restore image is no longer intact and my not function. If you get into the tool and it errors out, or you have no PC-Restore, then you will need to install XP from the CD and load drivers.

Oct 05, 2009 | Dell Dimension 2400 PC Desktop

1 Answer

My dell dimension c 521 has an amber light and fan running, and nothing else ?

Try Cleaning the RAM Like this image,6a95110.jpg
but first turn off the computer. than install it again to the DIMM slot, and turn on the computer. boot-up should be successful. Otherwise, replace the RAM, Hope this helps.

Sep 26, 2009 | Dell Dimension C521 PC Desktop

1 Answer

Black screen and numbers 2 and 4 lit

The 2 and 4 LED error code indicatesVideo subsystem configuration or failure”. You either have a bad video circuit or your video drivers have a problem. Try booting into “safe mode” by tapping the F8 key when powering on the computer. If the computer comes up in safe mode then your video drivers may have to be reloaded.

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

Nov 15, 2008 | Dell Dimension 9150 (DIM915MIN) PC Desktop

Not finding what you are looking for?
Dell Dimension E521 PC Desktop Logo

393 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell PC Desktops Experts


Level 3 Expert

5660 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18304 Answers

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

Are you a Dell PC Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides