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From the Pro 350 Pocket Service Guide, p. 49, Step 5 of the instructions on removing an I/O board from the card cage, comes a new experience in sound: 5. Turn the handle to the right 90 degrees. The pin-spreading sound is normal for this type of connector.
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                    (_)
          ^__^       / \
          (oo)\_____/_\ \
          (__)\       ) /
              ||----w ((
              ||     ||>>
 sysctl -w net.ipv4.icmp_echo_ignore_all=1