Flashing red light in HP Photosmart 7450 printer indicates that your printer requires your attention ..
Red and flashing: printer requires attention.
It could be because of several issues like …
Papper jamming
Cartridge problem
Connectivity problem
or can be anything like that
Just give it a thorought view if every thing is okay and still your printer is not responding then .. HP is always open for technical support and they will assist you for your problem .
For this particular model you can send them the mail at .. https://h10025.www1.hp.com/ewfrf/wc/emai…
Usually they respond withing 4 working hours

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