Blue Screen and Mini Display Port Screens

I have a Macbook Air 2011 model, it will connect fine to any Thunderbolt displays but as soon as it's plugged into a screen with the mini display port connector, the laptop will get stuck on a blue screen until it's disconnected, and as far as I know it should be compatible with both types
Usually a PRAM reset will resolve it, but it hasn't and attempted an SMC reset plus a Firmware update, no change either
What else can I try?

Welcome to Apple Discussions
If you experience a black screen, or otherwise have an unusable picture after changing to some resolutions, try resetting the NVRAM first.
If you continue to experience the issue, startup the Mac in Safe Mode.  Delete the /Library/Preferences/com.apple.windowserver.plist file and restart the Mac.
If the problem persists you may have a bad adaptor.

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