Sony PCG-NV290 - Manual (Page 49)

Connecting Another VAIO Computer
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and securely reconnect it to both computers. If neither computer responds
after a few moments, restart both computers.
❑ If the computers do not recognize the i.LINK connection after resuming
from a power saving mode (Standby or Hibernate), restart both computers.
For more information, see “Connecting VAIO computers.”