I have had a similer problem to this a few times. For whatever reason, the Subnet mask that was configured on the host (laptop/pc) was incorrect and therefore, the pings would get as far as the layer 3 device, (Router/Router switch) and no further. The other failure that I have found was that...
Do a debug ICMP on the Router, or use IP Accounting and then Ping the IBM, your Traffic may be getting there but not getting back.
Find out if any Configuration changes were made before this happened.
Are you using fixed IP Addresses or getting them from a DHCP?
If this Persdon used to be able to connect, but now she cannot, then something has changed, I would first find out if any configuration Work has taken place prior to the date of this occurance.
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