HP WiFi Printer stays offline after working Ok

[NewsBot]

My HP 309g printer indicates that it is on line and gives OK printout with test details showing all good.   It has been operating Ok for over a year.  I haven't installed any new software recently.  My computer says it is offline.  Router is Ok for internet
access.  I'm using Windows 7.  I must have missed some simple thing somewhere!!!  How do I get the printer back on line?

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