A:AnswerUnfortunately, the minimum requirements for the printer is 10.8 Mountain Lion. If you upgrade the desktop to that or higher, it will work fine.
A:AnswerYes, as a matter of fact, that’s how I have it connected now. Using it on wi-fi slowed it down considerably.
It doesn’t come with connecting cable, but BB sells them cheap..
A:AnswerHere is some troubleshooting that you can try: https://support.hp.com/us-en/product/hp-deskjet-3700-all-in-one-printer-series/8954253/model/11262035/document/c05040421 For further assistance, please contact HP Support.
A:AnswerIt works fine with mine. MAKE SURE you get the box that has the printer cord in the box in addition to the electric power cord. Read outside box to see what is included. Some have it on the outside of the box and some don't. Otherwise you will have to buy one.