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Going through your post, I understand that you are having issues with your Officejet fax machine. Let's start by running fax test to determine the issue. Follow the steps below:
On the Fax Setup menu, touch the Down Arrow (), and then touch Fax Tools.
Touch the Down Arrow (), and then touch Run Fax Test. The product displays the status of the test, and then prints a report.
Wait while the product prints the Fax Test Report.
Review the report.
If the report indicates the product passed the test and you still have problems faxing, check the fax settings listed in the report to make sure that the settings are correct. A blank or incorrect fax setting can cause problems with faxing.
If the report indicates the product failed the test, review the report for more information about fixing the problem.