from what i have seen on the web it sounds like it the Waste Ink Tank Nearly Full ,there have a reset
1 power of printer
2 hold resume buttton then press and hold power (the beeper may sound once.or may not depending on you model)
3 hold power and release resume
4 press resume twice then release both power and resume buttons
5 when the indicator lights steady,press resume 4 times (for the s900,3 times for the 8200 apparently)
6 press power to set data
7 print away