graphic does not appear [closed]

Question

The problem is the following: I have included a graphic (png) and get no error message, but the picture does not appear on the pdf? The .png file is correct, I do not know what could be wrong?

Here is my code:

\documentclass{book}

\usepackage[ngerman]{babel}
\usepackage{mathptmx}
\usepackage{color}
\usepackage[final]{pdfpages} 
\usepackage{xcolor,bookmark}
\usepackage{scrextend}
\usepackage{titlepic}
\usepackage{shorttoc}
\usepackage{courier}
\usepackage{type1cm}         
\usepackage{zref-abspage}
\usepackage{makeidx}         

\usepackage{graphicx}        % standard LaTeX graphics tool
                             % when including figure files
\usepackage{multicol}        % used for the two-column index
\usepackage[bottom]{footmisc}% places footnotes at page bottom
\usepackage{shadethm}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{xcolor}
\usepackage{marginnote}
\usepackage{mdframed}
\makeindex             % used for the subject index
                       % please use the style svind.ist with
                       % your makeindex program

\definecolor{shadethmcolor}{rgb}{.9,.9,.95}%
\definecolor{shadethmcolor2}{rgb}{1,.925,.545}%

\newtheoremstyle{mystyle}
  {\topsep}{\topsep}{}{}%
  {\bfseries}{:}{.5em}{}%

\theoremstyle{mystyle}

\newmdtheoremenv[hidealllines=true,backgroundcolor=shadethmcolor,skipabove=\topsep,
skipbelow=\topsep]{beispiel}{Beispiel}

\newmdtheoremenv[hidealllines=true,
backgroundcolor=shadethmcolor2,skipabove=\topsep,
skipbelow=\topsep]{formel}{Formel}


\begin{document}
\begin{figure}[H]
\includegraphics[scale=1]{Zinsrechnung.png}
\caption{geometrisches Mittel}\label{fig:zins}
\end{figure}
\end{document}

Answer 1

Graphic does not appear

What could be the cause for a graphic not to appear?

It may be usefull for all readers of this broad headline of the question to collect all frequent causes for invisible graphics. So please go ahead and add your experience.

• Graphic could be off the page; possible check: make the graphic much smaller and have a second look (\includegraphics[scaled=0.1]{picture}), put the graphic into the middle of the paper (\vfill\includegraphics{picture}\vfill), and make the paper larger (e.g. paper a2).
• graphicx package is in draft or demo modes. Or the main \documentclass uses draft option (this is passed to all \usepackages)
• The graphic file cannot be found, but the error is not seen because the user is using some kind of script which uses batchmode. Possible check: look for errors in the .log file.