My 5850 Hp printer just stopped printing letters, both ink Cartridges are full. What should I do now? It was working just fine then the pages started coming out blank.

Try running cleaning cycle multiple times. Sounds like ink tubes may be clogged.

Printing half a page with an Inkjet machine is not normally a computer issue. So windows 10 would not normally have any effect on the printing for a printer that has been accepted by the Windows 10 Operating System. If there was an issue in the software it would be printing gibberish or not printing at all.

Printing half a page is quite possably something stuck in the printer stopping the ink from getting to that half a page if it is printing down once side but not the other.
Printing half a page being that the top half is printed but not the bottom half (Or the other way around) it could be an air bubble in the feed line which can be cleared with a printhead clean or two.
Printing half a line rather than a full line such as the top half of each letter is clear but the bottom half of each letter is not visable is a blocked printhead. A couple of printhead cleans can also fix this.
Also check to see if the printer is not confused and actually has empty cartridges even if the printer thinks they are full. Brother printers can easily get confused about ink levels. If the cartridges are actually empty, replace them and away it should go again.

Hope that helps

Follow the steps to align newly installed cartridges.

• When prompted, make sure plain white letter or A4 paper is loaded in the input tray.

• Press the button next to OK on the control panel display.

• The product prints an alignment page.

• Place the alignment page print-side down on the right front corner of the glass.

• Press the button next to OK on the control panel display.

When the On button stops flashing, the alignment is complete. Remove the page and recycle or discard it.

Method two: Print an alignment page using the computer

• Double-click the HP Digital Imaging Monitor icon ( ) on the lower right side of the Windows taskbar.

• The HP Solution Center displays.

• In the HP Solution Center, click Settings . Then click Printer Toolbox .

• The printer Toolbox displays.

• Click the Device Services tab.

• Click Align the Print Cartridges .

• When prompted, make sure plain white letter or A4 paper is loaded in the input tray.

• Press the button next to OK on the control panel display.

• The product prints an alignment page.

• Place the alignment page print-side down on the right front corner of the glass.

• Press the button next to OK on the control panel display.

When the On button stops flashing, the alignment is complete. Remove the page and recycle or discard it.

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You may have a damaged yellow ink cartridge.

If the printer appears to print but there is no print or images on the paper then most likely the cause is the print head nozzles are blocked with dried ink and inserting new ink cartridges won't fix this problem. You need a new print head.
Print heads are not cheap, you may be better putting your money towards a new printer.

Step 1:-
First of all go to the printer--> Press setup button on it --> use the Arrow keys --> choose the tools option --> now choose the option Print a test page--> If the test page prints fine--> The printer is fine. No problem in the printer.
Else take out the cartridges and clean it with a lint free cloth. ( Remember when cleaning the cartridges DO not touch the nozzel of the cartridge. Just clean the out side of the cartridge nozzel.)
Step 2:-
Try to change the color of the font on the document you are printing and then try printing. You will get to know if it is actually printing or not. If it is not printing in color also then try this ...!
Click on start--> go to control panel--> go to printers and faxes or printers option and then right click on the printer and choose properties option. Click on the print a test page button.--> Check if it works.
Let me know if it works..!

The only way to stop this is to press the cancel button, just as it tries to print the test page.

Various people have said the printer won't align (calibrate) successfully unless both ink cartridges are more than 50% full, and until it aligns successfully, it will continue to print the test page on start-up.

It is a total waste of ink and paper, so remember to hit the cancel button when you turn it on.

Is it an HP printer? We had the same problem at work with print cartridges purchased at Staples. They have a major quality control problem. Your new print cartridge may be empty or dried out (died on the shelf). It's my problem at work, as I have over 80 HP deskjets, and Purchasing still insists on buying the Staples cartridges rather than the HP.

Sometimes if you shake a print cartridge really hard it may correct the problem. However, I would buy or borrow a black HP print cartridge and try it out in your printer. Works almost every time on the job. Good luck.

Did you solve this problem, the exact same thing has happened with mine?!?