Final answer:
To resolve the "image fuzzy" or "no sample" message, confirm the sample is present and retest.
Step-by-step explanation:
When an "image fuzzy" or "no sample" message is displayed, the best course of action is to confirm that a sample is present and retest. This means checking if the image or sample being referred to is actually there and properly connected. Restarting the computer or ignoring the message won't address the underlying issue, and calling technical support should only be done if the problem persists after confirming the sample presence.