How to debug issue when not throwing errors?

HI All,
I have a page that was working as designed. Someone added some code (but I have no idea what was added) and now a simple image link (a href)  does not work? When I click on it it doesn't throw any errors, it just does not work. How would I go about debugging this?

Thanks!
894359Asked:
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mcnuteConnect With a Mentor Commented:
Can't you send us a sample of the code? This would help enormously.
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Kyle HamiltonData ScientistCommented:
post a link to the page.
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Jerry MillerConnect With a Mentor Commented:
There are no backups of the page to determine the new code? You should always have backups of the current production code. Also keep the development code separate until it rolls into production.

Can you add a new link that works or do none of the links work on the page? A link to the page would be nice, but any code that you can show is better. Please remove any proprietary information before posting.
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mcnuteConnect With a Mentor Commented:
Well, maybe the code that was added replaced the image tag which looked like this:

<img src="some_image_src_path/image.jpg" alt="" onclick="dosomething()"  />

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and turned it into something like this:

<img src="some_image_src_path/image.jpg" alt=""  />

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if the onclick has been removed nothing will happen on click. Just a guess.
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894359Author Commented:
Sorry for late response. The code was rolled back to the working version and the broken code is in a dev. env. which nobody here can access. The code wasn't changed for the link but code via a Tag Management system was injected which caused the issue. Not sure how to pin point the issue? Thoughts?
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894359Author Commented:
Thanks for all the help. I understand this was difficult due to no code sample.
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