Please insert PSX format disk - still - i'm ripping my bloody hair out!!!!

I installed a psxone programmed modchip which i bought from maxking.com - i followed there own instructions and diagrams, onlt to see a "please insert psx format disk" message when i booted up.
So i removed the chip - but that message still comes up now the chip is not there.
What is happening - i fear a have knackered my ###ne (i have installed dozens of chips b4 without any probs)
PLEASE HELP ME!!!!!!!