I just changed my ink cartridge and now I keep getting "paper mismatch" errors. How do I fix this? T

All in one C4280
Windows Vista 32 bit
Just replaced the HP 74 print cartridge
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When you say you can't do the alignment, what happens?  Do you get an error message, flashing lights, or no response?  The good news is the problems you're describing typically don't indicate a hardware issue that would warrant getting a new printer.  Go ahead and try the steps in this document.  I'd also recommend unplugging the printer after you've removed the cartridges (per the steps in the document) and gently clean the contacts in the carriage that holds the cartridges.
Let me know if that helps.
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I am an HP employee.

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