linksys wrt54g HELP!!!!

so late last night the power cord for my router came unpluged, by the time i found out it had, all the setting were completely erased. thats not normally a problem but well im not a networking/wireless guru and it was set up professionally for our home network and i dont know how to set it back up again. under wireless networks on my computer it is back to linksys, when i try to connect to it, it shows al little yellow triangle warning sign on top of my connections button. tried the trouble shoot problems and it keeps saying that there is a modem or network cable unplugged. i checked EVERYTHING! nothing is unplugged. can anyone help me get it back working again. right now im plugged directly into the modem and im getting internet obviously because im typing this. i have entered into my routers setting a few times and cant find anything out of the ordinary. all i really need is a working connection secure with a pass code. which i have gotten set up but it still shows the little warning sign in the bottom corner that wont go away!
if anyone could help me it would be GREATLY appreciated!

 

I would record the settings that it is showing now. I would then do a router reset. There should be a reset button on the router and you may want to hold it in for up to a minute to make sure it resets. Prior to doing this you do need to have your ISP setup info for the router available.

 

ok ill try that.

 

fiddled with it most of the afternoon... cant get anywhere, im just gonna call in tomorrow to the local shop and see if they will come out and set it up again

 

u use cable?