The image of a cash register often means limited access to the world around you, which is blamed on money. You would rather have more than be more, indicating greed.
On the other hand, the cash register is a place where money is kept in an orderly fashion, protected and saved. In this case, Money is a symbol for your abilities and talents.
Folklore: Good omen, prosperity. [1]
A cash register whose drawer is stuck may remark on your inability to make money. [2]
