HP Officejet Pro L7780 All-in-one not scanning with Yosemite

I have searched for a workaround or fix to the scanning problem I'm having. I just bought a brand new Macbook Pro Retina and have loaded the latest printer drivers for the HP Officejet Pro L7780. The printer works ok, but I can't get the scanner to work. When I try, it says: "Failed to open a session on the device."
I'm using the printer over a wifi connection.
Can anyone help with this, please?!
Thanks!
peace,
bart

Hello,
This is to anyone else who can help I have the same problem with an Officejet 6500A Plus to the same laptop. It's ....... annoying, HP says nothing and so do Apple.

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HP Officejet Pro L7780 All-in-One Will Not Print Blue Ink - It Prints Pink Instead

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Actions taken:
1. Cleaned ink heads.
2. Replaced ink cartrige.
3. Reinstalled software.
Sugestions by HP customer service:
Purchase a new printer: Because the issue is software related - not reading the blue ink cartrige.
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Thank you for your time!
Thank you.
Sincerely,
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The cyan portion of the printhead may be clogged. I would suggest running the diagnostics shown here. If three levels of cleaning of the printheads does not resolve the issue you may need a new printhead.
Bob Headrick, HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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HP Officejet Pro L7780 All-in-One Printer & Verizon D-Link wireless router. will not connect

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aileensnider

Let's start here.
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http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02817031&tmp_task=solveCategory&cc=us&dlc=en&la...
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On a HP Officejet Pro L7780 All-in-One printer, is there a toner and where is it?

On a HP Officejet Pro L7780 All-in-One printer, is there a toner and where is it located? I've looked in Products and Supplies and don't see it but my printer is saying that it's low or empty.

By now, you have probably discovered that the L7780 does not use a toner but cartridges. It actually uses 4 HP 88's. They are black, magenta, yellow and cyan. Usually, black is the first to be replaced. They can be found at Staples, Office Depot and Best Buy.

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I am running Windows 8.1
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I can’t give you more than the info in my question about the model of the printer-HP Officejet Pro L7780 All-in-One printer
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I just recently tried to print and my printer can not be found I do not have the disk that came with the printer it is lost and it keeps telling me it can not find printer
This question was solved.
View Solution.

What operating system?
Download and run this utility: http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=mp-104282-2&cc=us&dlc=en&lc=en...
What does it say?
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I am employed by HP

HP Officejet Pro L7780 All N One and Eprinting

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Hi,
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Bump

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Same question as the last post only for a differnet printer model (sorry for what may seem like a duplicate question - I'm just trying to be sure I don't cause myself a headache later).
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Hello sixmil5, and welcome to the HP Forums, I hope you enjoy your experience! I see you have concerns about the printers internal memory. The memory is automatically reset when the printer power is unplugged, so you should have no issue with personal information being saved. Thank you for posting on the HP Forums and please let me know if you have any other questions.

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Hello,
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Hi there
I have some more suggestions for you to try. Please try them in order I have written them in.
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R a i n b o w 7000I work on behalf of HP
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“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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Hey , Thanks for posting in the HP Support Forum. I do see that a cracked gear in your HP Officejet Pro 8500 All-in-One Printer is impeding all functionality. I would like to help you with this but that particular part is not replaceable. I recommend you reach out to our tech support team to find out what servicing options you have available. You can click on the following link to initiate a case: www.hp.com/contacthp/
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Hello,
You can download the software for your product from the link provided below, after selecting the appropriate Windows 8 operating system of your computer:
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The link also has support videos that provide instructions on downloading and instaling the software.
Although I am an HP employee, when I offer advice on HP Products, I'm speaking for myself and not for HP

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I have recently moved house and changed my wireless router from BT to Virgin.
I am running OS X 10.9.5
I am able to print from my mac without issue, however, it has stopped scanning. I have managed to get it to work twice on isolated instances but it won't work consistently.
I have unistalled the software and reinstalled via the HP download page but when I open HP Scan and click scan it asks me to choose which scanner - mine is selected, it then says preparing to scan and it does that for ages until it says it can't get a connection.
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Hi there @Steph390 , welcome to the forums!
I have some suggestions for you to hopefully correct the scanning issue you are having. Please feel free to reply back and let me know the results!
1. Try power cycling the network devices:
Turn off the printer and computer and unplug the router for 1 minute (do not press any buttons on the router).
Plug the router back in and wait another minute, next turn on the printer and computer.
2. Mac OS X: How to reset the printing system
3. Repair disk permissions
4. Restart your computer.
5. Re-add the printer
Once the printer is connected on the network, follow these steps to maintain the wireless connection, normally a static IP will help out quite a bit: Printer Does Not Maintain Wireless Connection
Good luck to you
R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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There are at least three interlock switches that can cause this error. One is on the door that covers the ink cartridges, one is on the top lid (covering the "guts" of the printer) you lift up to service the printheads and the third is on the back duplexer; if you don't have a duplexer, there should be a cover in place. You'll need to check all three to be sure they're in working order.
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HP Officejet Pro L7780 All-in-one not scanning with Yosemite

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