Dell optiplex 990 1 3 on

Hi dears
in my Dell Desktop optiplex 990 two lights are on i mean the 1 and 3 which i am unable to install the windows what is the problem can any one help me.
actually i have purchased newly this computer.

thanks
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  1. According to your service manual found here
    ftp://ftp.dell.com/Manuals/all-products/esuprt_desktop/esuprt_optiplex_desktop/optiplex-990_Service%20Manual4_en-us.pdf
    on page 78, it means that there is an issue with the ram and has the following troubleshooting advice
    "Ensure that no special requirements for memory module/connector placement exist.–
    Ensure that the memory you are using is supported by your computer."
    Nothing more.
    I might suggest ensuring the ram is fully seated in it's slot(s)
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