Linksys router WAG354G with a Belkin switch

Hello,

I've had my linksys router working for ages (around 1 year) with 3 of my machines being connected throu a Belkin 5 port 10/100mbps switch.
Recently all machines stooped working when connected to the switch.
I am unsure now if the problem is on the switch or on the router as the router still works fine when I connect to it directly through one of those 3 machines.
Nevertheless, the switch still has its leds with the right colors?!!

Any suggestion?

Thanks

Francisco