Dell Dimension E521 PC Desktop Logo
Posted on Dec 17, 2008
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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.

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  • 4 more comments 
  • Anonymous 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.

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  • Posted on Dec 30, 2008
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I reseated the memory module and the computer booted normally. Your suggestion worked, thank you.

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  • Posted on May 26, 2009
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Change your computers memory module and have a try.

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