I need software for HP 7110.

The second link on this www8 hp com webpage may help you (1160 & 1320 software)
23.January.2015

I must warn you that this printer has an external power source - if you have lost it you must order it directly at HP, never use some cheap replacements bought at the store, only the official part. The power cable that plugs in the power source is your average pc power cable.  
After that you will need a LAN cable (for the internet) an phone cable (for the fax) and a USB cable (for the connection to the pc). All these cables can be very cheaply purchased even at
 WalMart for $5 each.

Connect the printer to the system and power on the printer. Start the system let it boot completely, put the CD that came with the Printer and install the drivers . From the same CD, run the setup to install the scanner software for the printer. Read cafefully the instruction on each installation wizard window that opens and follow the instructions.

However, if you are using windows 7 Operating system, just install the printer driver, go to start, All Program, Windows Scan and Fax. Lunch this and with it you can scan your document

Run the fax setup wizard to clear any personal information.
Or you can do it using the control pannel of you printer

I'm not sure you specified the correct printer. The 7110 printhead is not pentagonal. Is your printer the 7110 all-in-one?

which version of mac you have now ?

i think not driver properly instaled
remove and again install from here
http://multifunction.free-driver-download.com/HP/33559/HP-Officejet-7110-7115-7130-7135-7140-All-in-One-Basic-Software-Driver-1.00(A.16.03.05)-Windows-2000.html

Hi,

it might be a hardware issue with the printer however we still can try the following stes to reset the printer.

1
Take out the cartridges from the unit .
2
Make sure the unit is connected to the wall jack directly without any surge protector.
3
Unplug the power cord from the back of the unit ( without turning off the unit ) .
4
Now press the # and 6 key together , while holding these keys down plug in the power cord back into the unit .
5
Do not release the keys after a few seconds u will find te hp logo or bars moving across the screen .wait while the unit turns off.
6
after one minute turn on the prnter . it will go into alligment phase > let it finish .
7
after its done > try to make a copy

Thanks

Did you check HP's site? Give them a try @ http://h10061.www1.hp.com/ccsearch/search?pname=HP+Officejet+7110+All-in-One&qry=+scanner+can+not+communicate+with+computer&ctry=us&lc=en&dlc=en&mode=lz&tmv=0&method=prodFinder&pid=91473&productBigSeriesOid=91461&spid=91472&opname=HP+Officejet+7110+All-in-One&pname_desc=HP+Officejet+7110+All-in-One&ptype=consumer&stype=pn&contextual_lname=&spname=HP+Officejet+7110+All-in-One&temp_hql=s-001%2Cs-002%2Cs-004%2Cs-003%2Cs-005%2Cs-006%2Cs-017%2Cz-001%2Cc-002%2Cc-001&search=0&submit.x=8&submit.y=7

You can download the software for the 7110 from the link below: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&dlc=en&product=91472&lc=en&jumpid=reg_R1002_USEN You can download the software for the 5510 from the link below: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&dlc=en&product=311255&lc=en&jumpid=reg_R1002_USEN Please update the question & let us know if the information given was useful to you - Good Luck!