iP4300 Pixma - Not able to print anything even the test page

Dear all,

I am using a iP4300 printer and at no reason suddenly I am not able to print anything, even the test page.

Power up as it should but the orange light keeps flashing. All the catridges are new. I am powering off the printer and also pressing the button next to the orange light. But with no result.

Do you know any workaround to solve this?

Thanks

Panos