I just turned on my iMac, to see what appeared to be a small insect crawling on the screen. I attempted to wipe it off, only to find it is behind the screen itself, and I was seeing its shadow. Iv tried several things to kill it, but it just keeps crawling around. Every now and then, it will go "off the screen", only to return some minutes later. I presume it will eventually die, but i want to know what the solution is if i have the problem of a dead insect stuck behind me screen