You have no internet connection?
sounds if you need to configure your modem
for the flashing light on modem is trying to connect to a network
would need your login data from ISP to configure modem, best is to call them and have your modem manual handy an pen and paper to write down info
where is the the light flashing
By the power cord ....means PSU failure or hardware
By the lan connection ? means someone pinging your computer WOL
forgot try reading this link PSU
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flashing green light on back of tower. tower will not power up??
if flashing light on PSU....means failure flashing on What modem? system fax dial-up or stand alone, cable/dsl or RJ45 cable connection port (flashing green light on network connection means data traffic)
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