Why does wake on lan not work?

[cyborg]

Hey, I work in a net cafe, and recently two of the machines no longer switch on with wake on lan, although they are all the same hardware, and wake on lan is enabled on them all.

What could be wrong with these two? Is it possible the connection/wiring is faulty but still able to work on the network?

 

[Sp00n]

Tried a new cable?

 

[K.C. Leblanc]

Check they're properly shutdown and not in one of the various power saving modes.

Have you changed there network cards. WOL using MAC addresses no IP, so your wol software will need updating.