How do you match colors in PS7?

Hi,

Im recreating a fancy letter I saw with Photoshop 7. Everything seems pretty easy except some of the paragraphs are in baby blue. When I try to recreate this color in Photoshop using the PS7 color palate, on screen it seems baby blue, but when I print it(Epson C62)the end product looks light greenish. I scanned it & printed it, and the color didnt match the original copy. I tried RGB & CMYK & Im having a hard time trying to match to the original. How do people match colors?

Thank you

You are 100% sure you're ink cartridges are all full? That's the first thing I check.

And perhaps calibrate your monitor.

Thanks guys, I'll look into it.