Hi there, I would be happy to help you with your C310a. I understand you have changed your cartridges and now the middle of your page will not print. Please use the following link to troubleshoot the issue:
Fixing Print Quality Problems for the HP Photosmart Premium All in One... I hope this helps. If the issue persists, you might consider calling us. Don't hesitate to call, although the printer may be out of warranty, the cartridges could be in warranty; therefore, there wouldn't likely be a fee for the phone support. We will, at our option, either replace products
under warranty that prove to be defective or refund the purchase price.
We could even determine after troubleshooting that it is a problem with the printer, in which case they may offer you a discount on a newer model.
The number to call is 1-800-474-6836 for Canada and US, or you canContact HP Worldwide.
Best of luck!
I work on behalf of HP.
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