Several observations: First off, if you want to go with colored hyperlinks, you should probably use one and only one color; you can do so by setting the allcolors=<color-of-choice> option when loading the hyperref package.
Second, whereas many people are used to seeing "plain blue" hyperlink targets because that's what MS Word uses for all of its hyperlink targets, in my view "blue" (at least as defined by the color and xcolor packages) tends to look too light on many screens. If you load the xcolor package with the svgnames option, you can specify DarkBlue and NavyBlue, which will still be noticeably non-black when viewed on-screen but won't stand out as prominently as other, lighter shades of blue; moreover, when printed on a B&W printer the hyperlink targets' text will appear nearly as black as ordinary text.
Third, consider using the hrefhide package, as illustrated in the following MWE. This package lets you instruct the printer driver to print all hyperlink targets in black regardless of the actual color(s) used in the document.
\documentclass{article}
\usepackage[backgroundcolour=black]{hrefhide}
\hypersetup{colorlinks=true,allcolors=red} % use 'red' just for example's sake
\begin{document}
\hycon % turn on colored hyperlink targets
\begin{equation}\label{eq:1}
E = mc^2\,.
\end{equation}
As stated in \autoref{eq:1}, \ldots
\end{document}

Now, if you print the resulting document to paper, the hyperlink target "Equation 1" will be printed in black rather than in red, even on a printer that can print colors.
\definecolor{marineblue2}{rgb}{0.05,0.1,0.5}. Similar question: http://tex.stackexchange.com/q/52071/8272 – Nikos Alexandris Sep 26 '12 at 21:23