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On start up the monitor flickers constantly from black screen to the desktop

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One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they are probably old and faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error
also
click start control panel administrive tools computer management device manager scoll to ports(com&lpt)right click to scan for hardware changes or scroll to monitors + to expand plug and play monitor right click where you have options to update driver,disable.uninstall,scan for hardware changes or select properties where in the general you have the option to troubleshoot also in the driver tab you have the same options as when you first right click on monitor
also
click start control panel,display,desktop you can select a different desktop from the drop down list also settings you can change the settings for more or less pixels or from the drop down list pick the appropriate level of color range or troubleshoot also select advanced then general dpi normal size,larger size or custom settings
always click APPLY after making any changes
hope this helps

Posted on Mar 30, 2011

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You don't say if it's CRT old style or a new TFT screen,either way the first port of call is to right click on a blank bit of the desktop and choose properties from the menu,you should find a section with your monitor refresh rate on it,this is usaully set to 60hz by default,75hz or above should get rid of flicker if your monitor supports higher.....failing that,have you got anything recently placed near it that could interfere with signal such as a mobile phone?.....also check cables for condition and plug is secure.......if these fail you might have a fault developing in your graphics card or if its a TFT screen an ilumination tube maybe faulty inside the screen

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