Computers are no magical boxes, when they fail us, it is for a reason. Possible reasons are:
You are defective. This is the most likely. In that case, get another set of (hopefully less defective) eyeballs or repair yourself. The other comments have enough suggestions on how to do it.
Your hardware is defective. This also happens quite often (at least to me). Can the issue be reproduced on other similar devices?
Your toolchain is defective. Depending on which toolchain you use, this may or may not be likely. How much can you reduce the project with the issue still present? Does the byte code do what you told it to do in high-level language?
Did I miss any?
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