I have a HP PSC1500 All-in-One series printer/scanner/copier. I recently replaced the color cartridge and now every time I switch on it prints a test page. The only way I can get it to stop is by pressing cancel. I have scanned the test page as per the instructions on the printed page. I have also done a head alignment which I thought might help although it was not necessary. Could it be because I bought a compatable cartridge (Penguin) not an HP one which was double the price? Now I am wasting double the ink on test pages.