This post is not as much me needing help, but rather sharing the method I used to resolve my printer's seemingly bricked state of having a blinking power light with a 0 on the screen and no response from the buttons.
Symptoms: Power light blinks after plugging in power
A 0 is displayed on screen
Pressing and holding the cancel button results in the number changing to a 7
Pressing and holding the info button causes the 0 to flash, and can then be increased to any single digit number by pressing the info button further
Printer does not respond when plugged in with USB
Power down the printer or unplug it. Close all access doors. Plug a USB cable from the printer to a computer. Start the printer up. On the computer, allow the computer to scan for new printers, and when it finds the Deskjet 2600 series, install the "HP Smart" program. From this program, begin the "add new device" process, and select "connect printer to wifi". This will cause the printer to be broken out of it's bricked state and hopefully work again.
Hope this helps someone out, as I couldn't find any of this info anywhere online and had to trial and error my way through until I got it to work.
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