I have a DSL modem and a Linksys WRT54G router. They're both connected to an old Mac running OS 8.6. The old Mac is on the first floor of my house. I just bought a new iMac running OS X 10.4. It has built-in wireless access called Airport Extreme. The iMac is on the second floor. I believe I have correctly set up wireless internet access on the iMac-- the system looks for linksys and connects to it. When I launch Safari, the iMac's browser, it does in fact connect me to the internet. The Problem: I never know how long I'll stay connected. I'll suddenly lose the wireless signal and be stuck. I have to Quit Safari, reboot both the DSL modem and the Linksys router, then restart the iMac. Once I do all that, full wireless signal strength will be restored. Then I connect to the internet, eventually lose the signal, and the whole vicious cycle begins again. I've just read Simon's "How To Improve Signal Strength From My Router," but I'm embarrassed to say that I still can't decide what to do next. Does this scenario sound familiar to anyone? I can't see any obvious sources of interference near the router. Could there be objects near the iMac itself that could be interfering with reception? Is this a common problem when a router signal is downstairs and the "receiving computer" is upstairs? Would appreciate any suggestions, and I'll probably have to ask for directions on how to implement same. For example, I have no idea of how to change channels on the Linksys router, or even how to find out what channel it's currently using. I'm sure this is a dumb question that's been asked a million times before, but I can't seem to find any previous posts on it. Would appreciate any assist-- thanks! Mark A.