Need help for 2nd Line support interview at Xerox

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Hi there

Well i have been trying to get a job in IT ever since i graduated almost 2 years ago.
Finally landed an interview at Xerox at the helpdesk
I am really wanting to get this job to start a career in IT

The email i got says ''The interview will be competency based style questions, testing on your technical knowledge. ''
I have lots of knowledge of computers in general but not so much with printers etc

Would anyone happen to know what kind of questions i may be asked?
Thanks

job ad;

https://searchjobs.external.xerox.com/careersection/uk/jobdetail.ftl?job=581729