A very warm welcome to the HP community. A very good day to you.
I understand that you have an HP ENVY 5642 e-All-in-One Printer and after installing a new model the printer does not connect wirelessly. The printer tries to search but will not connect. Not worry, I'll do my best to help you.
I recommend you to perform the following steps to isolate the issue and arrive at a fix:
Restore network defaults on your printer:
From the printer control panel, touch Setup and then touch Network Setup.
Select restore network defaults. Press OK.
Re-run the wireless setup wizard:
This should make your printer connect to the new router's network. I hope this information helps.
Please keep me posted on the results. Cheers! 🙂
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