[help]Network connected but cannot ping everywhere

Pls somedy help me..my office have switch 24 port,and suddenly all the computer is cannot connect anywhere,every computer status is connected,and than I try to PING to one and another computer but it show "destinantion host unreachable" or " request time out"
fors first time I think my switch is broken and I decide to use another new switch,it can work but after using it half an hour it cannot connect again,the same problem from before

how do I solve this problem? What is the cause of this problem??

thxx..
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More about help network connected ping everywhere
  1. what are the IP addresses of each PC on the network? (or just some of then)

    do you have anthing giving out dhcp details?
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