I have an HP 8750 photo printer . It is just a little over a year old. I am having problems with it. I did not buy the extended warranty

. I need to print a large print of a collage I just made. I was about to print it when I noticed it was geyscale or all black and white. The color is not showing in the print box and I printed a small version of it and it comes out black and white. Help..This is for a Boutique I am going to attend this Saturday to show some of my collage work. Can someone help me please?? Thanks Neb
When I go to look in the printer software it was set to greyscale . I changed it and it still looked the same. How can I get my color back? Thanks Again