I have a D-Link 8-port Ethernet switch which was perfectly working. Since 2 days ago it makes the entire network down. The problem is when I disconnect the cables it runs again and after I connect "the last cable" it goes down again. No matter which cable is the last one, it becomes unstable and the network goes down. I've checked for IP conflicts and many other things, but I didn't find any clues to my problem. I even replaced the switch with a new one, but still there is no hope. Please help me find the problem.
closed as off-topic by HopelessN00b, mdpc, MichelZ, Jed Daniels, Falcon Momot Aug 14 '14 at 20:33
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