VSTs never make noise

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I understand how to instal VSTs and how to use them and everything but for some reason whenever I try to use them they never make any sound. I can't seem to figure out why and I've watched about every tutorial there is to make sure I'm adding them right
Did you use the Vst's suggested on the Lmms wiki?
https://lmms.io/wiki/index.php?title=Tested_VSTs

Also, see if this works:
Check the Lmms Settings menu.
https://lmms.io/wiki/index.php?title=LMMS_Settings

1) Go into the Lmms Settings menu and find the Audio Settings tab.
Change audio device to SDL.
https://lmms.io/wiki/index.php?title=Fi ... _1.1.0.PNG

Also:
2) In the same Lmms Settings menu, check to see if any weird symbols are in the folder paths.
eg. $ or % or # etc.
https://lmms.io/wiki/index.php?title=Fi ... _1.1.0.PNG

3) Press OK.

4) Close Lmms.

5) Restart Lmms, so that the changes will have effect.

Tell us what happens from there. 8-)
and also important OS / SP and name of fail VST