Just thought I'd try here before I get really depressed.

I have bought a cheap Q-TEC Broadband router (more fool me) which has the following problem.

You can plug any two machines into the router on any of the four ports and the internet and network works fine. As soon as I plug a third machine into the router, the router becomes inaccessible. Can't ping it etc. (destination unreachable)

However i need all four ports working as we have four computers (student house).

Anybody any ideas as to why, before I make the trip home and swap this for a decent router.

regards