R1900 not recognising cartridges

  m800afc 18:55 11 Mar 11
Locked

Windows XP Pro SP3; ASRock 775VM800; Pentium 4; 3GHz; 2Gb RAM
Radion 9700 Pro Monitor 1 - BenQ2400W (Landscape)
Radion 9700 Pro (Secondary) Monitor 2 - BenQ2400W (Portrait)
Epson R300, Epson R1900
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I have been using the same, unbranded,compatable cartridges in my R1900 printer for about nine months, with no problems. That is until today.
The cyan ran out, and I replaced it with an identical full cartridge. The printer started to prime the printer, but stopped, indicating that NONE of the cartridges were recognised. I removed and replaced them but no joy. If i turn the printer on, and try to print the cartridges are still not recognised.
Naturally this happens when I have a lot of printing to do, isn't it always the way?
Any help will be much appreciated.

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