Question about Dell Dimension C521 PC Desktop

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My dell dimension 521 comes on with the yellow light on and yellow light with a dark screen on the monitor.

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The power supply has to be replaced.

Posted on Sep 28, 2009

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Dell front panel power light abcd lights yellow


Does the monitor go out completely, no power? Or just lose a signal? Check ALL cables, AC and Monitor cables. Could be a Graphics adapter issue or Monitor , try another monitor.Your computer has a few miles on it , right? You could buy a PCI Graphics card if the monitor is OK.

Jan 01, 2013 | Dell Dimension 2400 PC Desktop

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I have a Dell Dimension E521. When I cut the power on everything comes on including the monitor, but the monitor will stay black. It does say something about power save hit any button but the screen


A solid green light means the computer is operating normally.

A solid yellow light indicates the power supply is operating normally but the computer is not processing data.

This could mean there is a problem with the CPu or another component on the motherboard.


((A blinking yellow light indicates the power supply is receiving power from the wall, but not functioning properly.
This generally means the power supply itself is bad and should be tested or replaced.))


A blinking green light means the computer is in standby mode.

You should consider visiting Dell Support and downloading the manual for your

your Dell computer. So use the LED power light codes if your Dell computer has them.

hope this helps

Sep 10, 2012 | Dell Dimension E521 PC Desktop

1 Answer

Very dark screen in full screen mode


Check the monitors native resolution (you can get it in their website's technical specification area and set the same resolution in your windows resolution.

Jul 22, 2012 | Dell Dimension 8400 PC Desktop

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Dell Dimension E520 blinking amber light monitor keyboard mouse dark


HERE is a link directly from dell as to what the lights mean and possible solutions. sounds like you may have a failed component on the motherboard or a bad powersupply

Sep 09, 2010 | Dell Dimension E520 PC Desktop

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The monitor screen goes dark, then comes back with everything enlarged and the colors wroong. Then, it goes dark again and comes back looking normal. What's wrong and what can I do? PLEASE HELP!! ...


could be with the monitor or video card/controller. first thing is to test another monitor if available and use a working video cable. if same thing happens, test if it is stable in safe mode. Restart the computer and press F8, then select Safe Mode. If display is stable in safe mode, it would be a video controller. Uninstall the existing driver, then download the latest one for your system through Dell support site.

Sep 06, 2010 | Dell Dimension 4100 (-JM0TB01) PC Desktop

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Monitor rejects computer


I'm just guessing, but it could be that the resolution you are using on your MS-DOS monitor is not compliant with the new monitor you are trying to use. Check the supported resolutions of the monitor that you would like to use, and then make sure you set that resolution before switching monitors.

May 10, 2009 | Computers & Internet

1 Answer

Monitor displays slowly after the computer starts.


try to turn off you screen saver just turn off power monitor to see monitor easy wake up after long time.if ok means windows screen saver have problem if still same look like is you monitor something wrong need to check

Jan 03, 2009 | Dell Dimension 2400 PC Desktop

2 Answers

No power light and flickering screen


try to replace the cables first. if it that doesnt help then replace the monitor.

Sep 25, 2008 | Dell Dimension 2400 PC Desktop

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