You can do several tests to understand where the problem is.1. Try to print a test page
- Go to Printer Devices
- Right click your printer and select Properties - Click Print Test Page
button like on the picture below
If the result is still like your description, you are facing hardware problem like defective toner cassette or drum.2. Try printing from different sources
- print a page from your browser like Internet Explorer
- print a page from your Office Application like MS Office or OpenOffice
- print from notepad
- print from Image viewer application
If your printer prints only the left half of the page - this is definitely hardware problem. If you receive different results from different sources, find out wich one of them does the described printout and try to discover the setting that causes the problem and restore it.Sometimes when we talk about MS Office this problem is caused by Print Area setting. You can just Clear this Print Area from Page Layout like on the picture below.
I hope this was useful information for you!