We have the network using a wireless access point and 2 network PCI adapters.
I was trying to get a better signal on the other PC and twisted the little aerial sticking out of the back when it came out of the little gold prong from the adapter. I stuck it back but it is not going in properly and have to admit my fingers are not very strong. On the other hand I do not want to exert too much force in case it is the wrong thing to do.
It is a Linksys Wireless-G PCI adapter.
I am so upset that I may have damaged it irreversibly.