Hey hey!
When I had this problem, it was one of the corners of the case that was being stubborn. I ended up finding out it was because the wire that fed info to the monitor was jammed in so tightly that it stopped the case from opening properly, and I had to open it juuuuust a little destructively before making space for the wire (by removing structural plastic from the case) when I closed it.
Hope you solve (or have already solved, considering how long ago you raised this issue) it soon!
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