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Network ADapter Gone

I have a Dell Inspiron 560 & the network adapter is  not showing up in the device mgr. I have installed a new NIC controller & NIC driver from Dell with no luck. this is an intergrated NIC into the motherboard.....WHen I try to install the NIC controller software I get this message:

"the realtek network controller was not found. If Depp sleep mode is enable diconnect the cable"


Any suggestons? How can I further troubleshoot this?
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cantoris
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I'd try this NIC controller on another machine and see if it is recognised there.  If it isn't then return it to Dell.
One more thing.  If it's there on boot but disappears later, there are some weird power-saving things that make the NIC appear completely disconnected on some newer laptops.  Your post does mention "deep sleep" - did you do what it says - does the NIC come back?