I own an MSI GS63 Stealth Laptop and had a fan wear out on me so I went ahead and purchased a new one to replace. I went ahead replaced the fan and it seemed to work just fine before I put it in. Once I started the computer up the fan spun a bit but seemed like it was struggling. After that I noticed that when the laptop was level the fan refused to spin but then at certain angles it would attempt to spin but couldn't get up to speed. While it spins it will also make a but of an off balance sound not sure how to do describe it.