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I'm assuming all your PC's are Windows 7 because homegroups are specific to this OS and for mixed OS e.g. Windows 7 and XP a different arrangement is necessary.... remember also that not all versions of Windows 7 support homegroups I believe (please check as I am not certain about this)
All the PCs are using the same version of Windows 7. :P
FYI: Before this problem occured I had another problem with the same PC: when accessing the PC via Homegroup all the libraries were
incorrectly shown as empty. In the hope of solving this problem I tried to rejoin it with Homegroup. Unfortunately this left me with the current situation (in which the PC is totally invisible to other PCs).