Lexmark X 5150 prints blank pages

If you're using Windows, try to follow these steps to fix the problem.

1. Start menu > Printers & Faxes > Lexmark Pro200 Series Properties window pops up > go to Advanced tab > Printing Defaults.
   
2. The Lexmark Pro200 Series Printing Preferences window pops up > go to Advanced tab > More Options > under Suppress Blank Pages, enable "Enable blank page suppression"
   
3. Save the setting.
4. Try to print a document again to verify that the problem is fixed.

This likely to be a faulty cartridge.

There are a number of things that can result in blank pages, but if the cartridge has just been changed (and the old one was fine apart from being 'empty'), you should be talking to your supplier.

Usually, when the printer prints, but the page comes out blank, the print head on your cartridges is clogged. Since you pointed out that you computer was repaired, I guess you weren't printing during that period, so it is quite normal that the cartridges won't print. Here is a link to Lexmark's site.
http://support.lexmark.com/index?page=content&id=HO1562&actp=search&viewlocale=en_US&userlocale=EN_CA&segment=SUPPORT&productCode=LEXMARK_X1150&searchid=1270554483928.
Read carefully and follow the instructions. If necessary, do several nozzles cleaning, but do bear in mind that it uses a lot of your ink.

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Yes - Computer need driver software for printer to print

Download Software drivers by click on the Lexmark x5150

Lexmark X5150

Most likely cause is the ink cartridge needs replacing / refilling. Did it stop printing part way through a page?

make sure the driver installed correct. check below link for more details about the drivers
http://etech.maiila.com/lexmark-x63-driver-manual-software-download-and-troubleshooting-tips

If you try and print a test page form the printer it will be light also. If this is the case you have a cloged cartridge. You can try to clean the cartridge, or replace it.

Check pages 76-80

try a test page, first, please..computer disconnected from printer..

and go get fresh set of printer drivers here

sounds like clogged print heads. do a clean print heads, then a test page, and see how that goes. Like a sink that gets clogged, when it's not used, print heads need exercise, otherwise, they can get some gunk on them, and no more printing.