My Epson TX 121 arrived in the mail today.I installed all the software and hooked everything up.I need to scan some documents immediately.when i open Epson scan software on the pc i get the error 'Cannot communicate with the scanner. Make sure the scanner is on,correctly set up and connected with no errors indicated.' I have not installed the ink cartridges. Epson owners or printer/scanner pros kindly help me out. Thanks in advance.