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)
Is this a good question?