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I would not give up on your printer, yet, unless you just are ready to upgrade. Since you did not list the printer product number I can't look to see if there is a current manual available on HP for it. I can only guess at some possible fixes. First, I would unplug the interface cable and the power plug from the printer. Press and hold the Power button down for 10 to 15 seconds. On many HP printers this will Reset the printer and tends to fix a lot of issues. On some printers you have to complete the alignment after changing the cartridges before the printer becomes functional.
If the HP cartridges are refills from a third party, there may be an issue with the onboard chip that has not been reset.
Anyway
The 98 and95 are compatible with these HP Deskjet, Officejet, and Photosmart printers.
You should go to hp.com and look up the printers to verify this information, or if you decide to
purchase one of the printers.
Deskjet 5940 and 5940xi
Officejet H470
Oj 6310xi
Oj 100 (L411a)
Oj 6310xi
Photosmart 2575v and 2575xi
Ps 4150
Ps 5060 and 5065
Ps 5145 and 5155
Ps 8049
I hope this helps you.
Good. You have tried both resets, which means you did some searching on your own.
According to the information for the 5100 series I found at this link,
the Exclaimation is a General indicator of an error status of some kind on the printer. My thoughts;
A. Bump printer and a red light flashes, indicating intervention needed. Many times the printer will think a cover/door is open). I do not see an indicator that specifically points this out, so check all (door covering the ink cartridges, The CD cover, the rear cover, the top cover, etc)
1. For a magnet or small metal disk that has fallen off. Some printers use the magnet to activate a switch.
2. A tab on the cover that should either push a switch.
3. A tab that inserts between a "U" shaped sensor and block the led light.
4. If you can, check and see if any wires have come loose any of these switches.
5. Open the CD and close it, if you can.
6. If you have a memory chip in the printer, remove and reinstall it.
B. The Exclaimation with circling dash is not listed on the chart, or the manual. Ar you seeing this on the printer, or the computer. From my experience this is usually relates to something initailizing. Usually, if left alone it will complete over time (or come up with another error 
)
