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I have a problem to connect internet with cable and wireless to my computer and also I upgrade my c

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You have a HP dc7800 Convertible Mini Tower (CMT).


Here is the HP support page to that model...


Here is the link to the quickspecs page for that model series, which shows the available processor, memory and graphics adapter upgrades.


You did not provide enough information for me to help you with the network connections.


Do you need drivers?  For what operating system?


Hardly any dc7800's came with built in wireless networking.

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