Buzzing noise but picture is perfect
My Optima HD20 was in regular use for 4 years from 2013 to 2017. I moved since then and it had been in storage since 2017 till now (2019). I plug it in and the image quality appears to be perfect but is making a moderately loud buzzing noise. The strange thing I hold it up on its side (with projector lense up) the buzzing stops. Any ideas what may be the problem? And more importantly the fix! (hopefully an easy one)