Q: can not print to epson wf-3540.  It is wired.  My iMac can print to the printer using the same cable.

Hi Adellefrommn,

I understand your MacBook Pro was printing fine but last week it stopped printing.  Resetting the Print system is one of the later troubleshooting steps.

Troubleshooting printer issues in OS X

http://support.apple.com/kb/TS3147

If the issue persists, try these additional steps:

1. Reset the printing system, then add the printer again.
2. If the issue still persists, reset the printing system again.  Download and install your printer's drivers. Then, add the printer again.
3. Contact the printer vendor or visit their website for further assistance.

You might also want to test under a different OS X user.

Best regards,

Nubz