My printer (HP8500) is wi-fi connected to my imac and my macbook. works fine from macbook, but has stopped working on the imac--shows offline. How can I fix this? Thanks

I have an iMac and MacBook Pro, both running Snow Leopard at current maintenance levels. I have an HP8500 printer connected via wi-fi. All have been working well until just recently. Now, the iMac cannot communicate with the printer. The printer icon shows offline. The printer is still online to the MacBook. I suspect a related problem is that when I try to access files on the MacBook from the iMac, I get a message that they are unavailable, but re-clicking once or twice to re-try works and the files are accessible. The only problem is that I cannot modify them from the iMac, even though the sharing options are set for update capability.
Resetting the printer and re-booting the iMac don't help.

Yosemite is a big problem.
I recommend you factory reset the TC and start over.
Factory reset universal
Power off the TC.. ie pull the power cord or power off at the wall.. wait 10sec.. hold in the reset button.. be gentle.. power on again still holding in reset.. and keep holding it in for another 10sec. You may need some help as it is hard to both hold in reset and apply power. It will show success by rapidly blinking the front led. Release the reset.. and wait a couple of min for the TC to reset and come back with factory settings. If the front LED doesn’t blink rapidly you missed it and simply try again. The reset is fairly fragile in these.. press it so you feel it just click and no more.. I have seen people bend the lever or even break it. I use a toothpick as tool.
N.B. None of your files on the hard disk of the TC are deleted.. this simply clears out the router settings of the TC.
Redo the setup from Yosemite.. it needs to be directly involved in the setup to remember anything.
Please use short names.. no spaces and pure alphanumeric. eg TCgen5 base station name. TCwifi as wireless name.
Set password WPA2 Personal security which is pure alphanumeric mixed case and numbers.
Please empty out all the old wireless names from your devices.. reboot them and rediscover the network.
If it still fails tell us.

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