tests to be done
first unplug your router for 2 mins then plug back in and wait 5 mins
than once your back go to start then run or search bar then type in cmd and click enter
dos screen pops up do comand above and get 2nd box up
type the following then press enter
ipconfig
then you wil get a list one will be your default gateway something like 192.168.1.1.
run the following
ping 192.168.1.1 -t
this depends on the default gateway if its different use that number remember spaces and dots in the command matter , you should start getting replys
in other box type
ping
www.google.com -t
now watch these two if 192.168.1.1 is ok but google is not replying its isp
if both go then it could be router and will need replaced but in most cases isp take care of routers too
hope this helps
oh and after reboot of router everything is grand dont worry somethimes routers just need a reboot every now and then