Having issues running test on different machines

I am getting different results when I try to run my test suite on different machines. I should be getting 30 passes like I do on my machine but when I run the same test on the other machine I am getting mostly errors, findfailed and Null pointer exception. So for the other machine we are using a second monitor since the laptop is at lower resolution than mine, with the Monitor it still has a slightly lower resolution than mine. Any assistance with this issue would be appreciated.. I believe its resolution is the issue