Are you getting the capitalisation right? Is there an "eye" to the right of either the username or password as you enter it, to show what you have typed before going to the next field?
As the supplied one modem has died so soon you are entitled to a replacement, presumably pre-configured. Make sure you request that. It's possible you wrote something down wrongly. Os and 0s are the usual suspect.
There's also the possibility their system has blocked access if the wrong password has been repeatedly entered. Three wrongs is usually enough. Check that with them.
You should also have received written documentation of your account and login details. Not just a modem/router to Plug n Pray.
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - AAISP Home::1 80/20. Sync 59504/15641kbps @ 600m. - BQM
Edited by RobertoS (Thu 11-Feb-16 09:26:02)