Epson STYLUS PHOTO R2400 Manual page 289

Print Head Carriage Problem
If the carriage cover does not close or the print head carriage does
not move to its home position, open the carriage cover and push
the ink cartridges down until they click into place.
Correcting USB Problems
USB connections
USB cables or connections can sometimes be the source of USB
problems.
For best results, you should connect the printer directly to the
computer's USB port. If you must use multiple USB hubs, we
recommend that you connect the printer to the first-tier hub.
Troubleshooting
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