A while ago I was looking to use my old WRT54G v2.2 router for a wireless ethernet bridge. I flashed it with tomato but couldn't get it to work. Other people seem to have had more success with dd-wrt, so I was going to try that but I plugged in the router via ethernet and couldn't access it at the default IP (192.168.1.1). As far as I remember, Tomato worked for the most part when I first set it up, but I just can't access it at all now.
I also tried a 30-30-30 reset a couple times but it didn't seem to do anything.
More aboutacces wrt54g setting tomato
Do you have your PC/laptop configured properly (w/ DHCP enabled)?