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I cannot format dell 780 what is the solutions?

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you have to format your hard drive using a third party disc to erase everything on your hard drive

During the boot process you will see on the screen to press a certain key to enter setup

Press and hold that key during the boot up process to enter BIOS the scroll down to advanced bios features press enter change your first boot device to cd,press escape then press f10 to save to cmos to restart

note this will erase you operating system you will have to have an operating system disk to load it onto you hard drive or create a partition to load another operating system

(note after you have loaded the operating system you must go back and change the first boot device to your hard drive)

hope this helps

Posted on Mar 31, 2011

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http://www.dell.com/support/troubleshooting/us/en/19/Product/optiplex-780

Diagnostics > Diagnostic Lights,

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Here is a link to your computer's service manual that has a chapter on diagnostics including Beep codes:
ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-780_Service%20Manual_en-us.pdf
This for the desktop model. If you have a different model you can choose from this link:
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Start your PC and press F8 several times until the boot menu comes up. Then select "Safe Mode with Networking".

Now start looking for your drivers here:
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hi, the link below will take you to the correct driver download page , i always instal the chipset then the network drivers .
http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=19&l=en&s=dhs&ServiceTag=&SystemID=PLX_780&os=WLH&osl=en&catid=&impid=
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