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you have to check those.
1) reset_n
do you give reset signal to nios?
at least you need to give signal which stuck high.
or a pulse it becomes low once is better.
2)JTAG uart.
if your Qsys does not have JTAG uart.
you have no way to connect with your Qsys.
3) clock.
you certainly need clock after all.
you need double check if the clock is correct.
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I'm not sure if there is something wrong with my Qsys design.
You may look from the link
http://i.imgur.com/l4vag3w.png It gives no errors in Qsys, it compiles but when I try and run my program it won't start.