Can I print in Black on my Lexmark Platinum Pro905 with a low colour warning? seems to stop all printing even with a full black cartridge?

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You won't be able to print if one of the cartridges is out of ink. The printer will prime every once in a while thus the need for all cartridges to have sufficient ink levels to prevent damaging the printhead.

The Lexmark Platinum Pro905 needs all four inks to have substantial ink for printing at all times in order to prevent damage to the printhead. This is why a user has to replace empty ink cartridges to continue printing. This includes color cartridges for black only jobs.

You may have been impacted from a printhead issue affecting a limited number of our devices. Please visit the Lexmark support page to determine if your printer is affected with the printhead issue. You will be asked to enter your model and serial number. Also, make sure your printer is updated. The firmware update will help give you a highly reliable print system.

Click here to validate your serial number and/or update your firmware.

For everyday printing you may find that "Quick Print" or "Draft" mode gives good-enough print quality and greatly reduces your ink consumption. In Windows click the preferences button in any print dialog. On Mac you look in the Print Settings pane of the expanded print dialog. If you don't mind small print, you can also try "n-up" printing that will squeeze two or more pages onto a single sheet of paper.

We're sorry to hear that you're having problem with your printer. That sounds like a printhead problem. Lexmark recognizes that some of our inkjet all-in-one customers may be experiencing issues with their print quality. We take our customer user experience very seriously, and we strive to ensure that each time a customer prints using a Lexmark device the page is crisp, clear and up to the highest standards.
However, if your device is displaying a 'printhead error' on the hardware and/or you are suddenly experiencing a print quality issue, please contact the Lexmark Technical Support Center at 1-800-539-6275.
Lexmark agents are prepared and able to help diagnose and resolve your issue. This may involve updating your printer firmware and/or replacing the printhead for your printer, at no charge to you, our customer. Installation is quick and easy for any customer to perform.

Does the ink stuck up for a long time. I mean you do not print anything for long period of time? If yes, the ink dries up and try to clean the ink head by using rubbing the ink head cartridge to plain paper with isopropyl alcohol.

If not, the best way if to replace the ink cartridge and it will be fine printing.

Make sure you are using genuine Lexmark cartridges. It could be that your black cartridge needs cleaning. Try to do the Deep Clean Printhead function on the printer. Press Ink Levels -> press More Options -> select Deep Clean Printhead. The printer will then print a clean cartridge nozzles page. If black ink is not printed on the page, you may need to update your printer's firmware. The update corrects print quality issues on your printer. You can easily download and install the update using this link Lexmark Platinum Pro905 Firmware Update. Download and install the Pro905 update. Thanks.

It could be that the cartridge has become dry.
you have to try several head cleans using the printer software and if that doesnt help then the cartridge needs to be replaced.

apparently the default printing color has been changed, you have to change it back either from "control panel/ printers /right click on your printer and click properties, and choose color for printing." or you can do it per printing job, when it shows u the printing options, (like number of copies and other (basically same window from the control panel). if you do it from the control panel whatever you choose, that would be the default, otherwise it is per job change and is not permanent.