yahoo messenger won't connect

We had INSIGHTBB for our server until COMCAST took it over. Till then I never had problems w/ connecting to Yahoo messenger. After that it was hit & miss & now it is never. I get the message that they can't sign me in & check my online status. I have removed the program, reinstalled it w/ updates, I have tried the BETA version, went back to pre update version, I have turned off the computer, rebooted, unplugged all appliance (printer etc) including from the modem box still with no luck
I have called comcast said it wasn't there problem. This last time that made me stay disconnected we had lost our power from comcast--TV, computer & telephone. I have a network set-up with hubby's laptop using LINKSYS & he has connection to yahoo messenger. So what do i need to do? I have connection to AIM, & windows messenger.

 

Did you shutdown your computer after you uninstalled the program to delete any cache d files that your computer would automaticly retrieve to reinstall ym? I know it's kind of dumb and tedious but I've had it happen to me before.

 

oh yes several times because I've done it more than once in the hopes it would work. & had teh tower off for >5min etc.